Open Cell vs Closed Cell Memory Foam: 7 Cooler Picks (2026)

If you have ever woken up at 3am in a puddle of your own sweat, cursing the mattress that promised “cloud-like comfort,” you have almost certainly met closed cell memory foam. The debate around open cell vs closed cell memory foam sounds like a technical footnote, but it is actually the single biggest reason some memory foam mattresses sleep like a sauna while others feel genuinely fresh. Foam cell structure decides how much air can move through the material, and air movement is the main mechanism your mattress has for shifting body heat away from you overnight.

Here is the short version, because you shouldn’t have to read a chemistry textbook to buy a bed: open cell foam has interconnected air pockets that let warm, moist air escape, while closed cell foam traps air in sealed bubbles that hold heat against your skin. Traditional 1990s-style memory foam leaned heavily on that closed, dense structure, which is exactly why “memory foam sleeps hot” became such a persistent complaint among UK shoppers. Modern manufacturers have spent the last decade engineering around that flaw, and this guide breaks down what actually works, based on real specs, aggregated review sentiment, and independent testing data rather than marketing copy alone.

We have researched seven real mattresses and toppers currently available through amazon.co.uk, spanning budget, mid-range and premium price brackets, and paired that with a proper explanation of the science so you can make sense of terms like CFM, Octaspring and BioCell before you commit your money.

Quick Comparison Table

Looking at the spread above, the clearest pattern is that almost every mattress worth recommending in 2026 has quietly moved away from dense, closed-cell comfort layers. Even budget picks like the Eve Original now lean on open-cell or moisture-wicking constructions, which tells you how thoroughly the “memory foam sleeps hot” complaint has reshaped product design. If your budget is tight, the topper is worth serious consideration since it lets you retrofit breathability onto a mattress you already own rather than replacing the whole thing.

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Top 7 Open Cell Memory Foam Mattresses: Expert Analysis

Every product below has been assessed on real specifications, aggregated customer sentiment from verified retailer and marketplace reviews, and independent testing coverage where it exists. Where genuine third-party review data was thin, that is stated plainly rather than papered over.

1. Simba Hybrid Pro — graphite open-cell foam with spring-driven airflow

The Hybrid Pro sits at the top of Simba’s range, and the standout feature is Simbatex, the brand’s proprietary open-cell foam infused with heat-filtering graphite particles. Independent testers have found the open-cell structure delivers a genuine step up in breathability compared with standard memory foam, even if Simba’s own “30 times more airflow” claim cannot be independently verified. Underneath, dual Aerocoil spring layers create physical air channels through the mattress core, which matters because foam alone, however open its cells, cannot match the ventilation a sprung layer provides.

Based on the spec comparison with rivals in this list, the Hybrid Pro earns its premium price through this dual approach: open-cell chemistry on top, mechanical airflow underneath. Reviewers consistently note the mattress feels noticeably cooler than older Simba models and rivals with closed-cell comfort layers, particularly for back and stomach sleepers who benefit from its medium-firm response. What the spec sheet won’t tell you is that edge support, while improved on newer models, still lags behind competitors like Levitex, so perch-sleepers who like to sit on the mattress edge may notice some give.

Pros:

✅ Graphite open-cell foam measurably reduces heat build-up

✅ Spring layer adds real airflow channels, not just foam tricks

✅ Strong motion isolation for couples sharing the bed

Cons:

❌ Among the pricier options in this list

❌ Edge support trails some spring-heavy competitors

Sitting in the premium bracket, typically well above £700 for a double, check current price before buying, but for hot sleepers who also want some bounce underfoot, the value case is solid.

2. Emma Original — best all-round breathable bed-in-a-box

The Emma Original has become something of a default recommendation in UK mattress guides, and the standout feature is its three-layer build topped with a genuinely breathable comfort layer rather than dense closed-cell foam. Underneath sits a supportive memory foam layer, finished with a zoned base foam that carves out cutouts to aid spinal alignment.

Here’s what to weigh: the top layer is engineered specifically to avoid the “heat trap” complaint that dogs cheaper all-foam beds, and independent reviewers have rated the airflow as one of the mattress’s strongest features, describing it as staying neutral in temperature even on warmer nights. The removable, washable standard cover is a genuinely practical touch that most competitors in this price bracket skip. Based on aggregated review sentiment, the Emma Original suits combination sleepers well, since its medium-firm profile avoids the extreme sink of denser memory foam while still offering pressure relief at the shoulders and hips.

Pros:

✅ Removable, washable cover is rare at this price point

✅ Balanced medium-firm feel suits most sleeping positions

✅ Strong, consistent review scores across independent testers

Cons:

❌ Less plush “hug” feel than denser premium foam beds

❌ Firmness may feel too moderate for committed side sleepers

Sitting comfortably in the mid-range bracket, this is the pick most buyers should start with if they are unsure what firmness or feel they actually want.

3. Nectar Premier — cooling cover over dense contouring foam

Nectar built its reputation on deep, marshmallowy contouring, and the Premier model is the brand’s answer to the “but does it sleep hot” question. The standout feature is a cooling cover woven with heat-wicking fibres, paired with a more breathable construction than the entry-level Nectar Classic.

What most buyers overlook about this model is that Nectar hasn’t abandoned the slow-sinking feel that made the brand popular; it has simply engineered around the heat problem rather than sacrificing contour. Testers have described the feel as “dense, doughy and slow-moving” with genuinely reduced surface heat build-up compared with the Classic, plus excellent motion isolation, useful if you share a bed with a restless partner. Reviewers consistently rate the responsive transition layer as a meaningful upgrade, since it stops sleepers feeling permanently “stuck” the way older dense foam beds can.

Pros:

✅ Deep pressure relief for side sleepers with hip or shoulder pain

✅ Cooling cover meaningfully outperforms the entry-level Classic

✅ Excellent motion isolation for co-sleepers

Cons:

❌ Slow-sink feel won’t suit sleepers who dislike “hugging” foam

❌ Edge support is a known weak point in this range

Priced in the mid-to-premium bracket, it rewards buyers who specifically want that classic memory foam cradle without the classic overheating problem.

4. Panda Hybrid Bamboo — eco-friendly open-cell bamboo foam

Panda London’s flagship mattress uses BioCell Foam, a bamboo-infused open-cell material, and the standout feature is genuinely sustainable positioning without sacrificing sleep performance. Underneath sits OrthoAlign Foam with multi-zonal springs designed to distribute weight evenly across the body.

Based on the spec comparison, the open-cell bamboo top layer is marketed as naturally hypoallergenic and sweat-wicking, and the honest analytical read is that bamboo-derived fabrics generally do perform well for moisture management, which lines up with what reviewers report. It sits on the firmer side of medium, so this is not the plushest bed on this list, and reviewers note it may not suit sleepers who specifically want a deep, cushioned sink. What the spec sheet won’t tell you is that the firmness actually works in its favour for spinal alignment, particularly for back and stomach sleepers who need more resistance than a soft foam top layer provides.

Pros:

✅ Bamboo-infused open-cell foam aids sweat-wicking and hygiene

✅ Multi-zonal spring base supports even weight distribution

✅ Strong sustainability credentials among UK mattress brands

Cons:

❌ Firmer profile won’t suit sleepers wanting a deep hug

❌ Premium eco-materials push the price above budget rivals

Sitting in the mid-to-premium bracket, this is the standout pick for anyone prioritising sustainability alongside genuine breathability.

5. Dormeo Octasmart Plus Mattress — open-cell foam over foam-spring hybrids

Dormeo’s Octaspring range takes a genuinely different engineering approach, and the standout feature is a top layer of open-cell memory foam sitting above hundreds of honeycomb-shaped Octasprings made from foam rather than steel. A supportive Ecocell foam base finishes the build.

Reviewers consistently note that this construction avoids the classic memory foam “stuck in bed” sensation, since the foam-spring layer responds more like a traditional sprung mattress even though there is no metal involved. Dormeo’s own testing claims an 8-times breathability improvement and a 3°C temperature reduction versus standard foam; independent third-party lab verification of that exact figure is limited, so treat it as a manufacturer claim rather than a confirmed number, though the underlying open-cell-plus-ventilation-channel logic is sound engineering. Aggregated customer sentiment on Dormeo’s Octaspring line is generally positive for initial comfort, with some longer-term reviews flagging softening in the Octasprings after a few years of nightly use.

Pros:

✅ Foam-spring hybrid avoids the classic memory foam sinking feel

✅ Genuine structural ventilation channels, not just foam chemistry

✅ Long manufacturer warranty reflects confidence in durability

Cons:

❌ Some longer-term reviews report softening after several years

❌ Rotating rather than flipping required to maintain even wear

Priced in the mid-range bracket, it is the pick for anyone who has tried memory foam before and specifically disliked the sinking sensation.

6. Eve Original Hybrid — budget-friendly moisture-wicking foam

Eve’s entry-level hybrid is built around what the brand markets as ultra-breathable memory foam, and the standout feature is that this cooling-focused engineering appears even at the budget end of the market rather than being reserved for premium beds. The construction pairs a moisture-wicking foam comfort layer with a supportive base.

Here’s what to weigh: genuine third-party lab testing specifically isolating this model’s cell structure is more limited than for Simba or Emma, so some of the brand’s breathability claims are harder to independently verify, and that gap is worth noting rather than glossing over. That said, customer feedback on retailer pages is consistently positive about the mattress feeling noticeably cooler than older, denser foam beds at a similar price. Based on the spec comparison with pricier rivals, the trade-off is a slightly less sophisticated cover and support system, though for buyers testing whether open-cell foam suits them before spending more, it is a sensible entry point.

Pros:

✅ Genuinely budget-friendly entry into breathable foam

✅ Moisture-wicking layer helps with clamminess, not just heat

✅ Good starting point for first-time memory foam buyers

Cons:

❌ Independent lab verification of cooling claims is limited

❌ Support layers less sophisticated than pricier rivals

Sitting in the budget bracket, this is a sensible low-risk way to trial open-cell foam before committing to a premium bed.

7. Dormeo Octasmart Deluxe Mattress Topper — refresh an existing bed with open-cell foam

Not everyone needs, or can afford, a whole new mattress, and the standout feature of this topper is that it transforms an existing bed’s breathability rather than requiring a full replacement. The top layer is open-cell memory foam, chosen specifically because open-cell construction is softer and allows meaningfully better airflow than standard closed-cell toppers, sitting above a middle layer of Octasprings and a memory foam base.

Independent reviewers have praised the cloud-like comfort and genuine cooling performance, describing the combination of open-cell foam and the honeycomb Octaspring layer as delivering plush comfort without the heat build-up typical of dense topper foams. The cover is OEKO-TEX certified and made from recycled materials, which is a genuine sustainability credential rather than greenwashing. What most buyers overlook about toppers generally is that a good one can meaningfully extend the useful life of an ageing mattress, delaying a much larger purchase.

Pros:

✅ Genuinely transforms an old mattress’s breathability and feel

✅ OEKO-TEX certified recycled materials, real sustainability credential

✅ Far cheaper route to open-cell comfort than a new mattress

Cons:

❌ Cannot fix poor underlying support from a worn-out mattress

❌ Premium version pushes close to budget mattress pricing

Priced in the budget-to-mid bracket depending on size, it earns its place here as the lesser-known but genuinely high-quality alternative for anyone not ready to buy a full replacement.

Reading across this table, the throughline is that every genuinely cooler option pairs open-cell chemistry with a second mechanism, whether that’s springs, graphite or a moisture-wicking cover, rather than relying on open-cell foam alone. Warranty length is also a reasonable proxy for manufacturer confidence in durability, and it’s worth noting that foam-spring hybrids like the Octasmart range carry unusually long cover terms.

What Is Open Cell vs Closed Cell Memory Foam?

Open cell vs closed cell memory foam describes two different internal structures within polyurethane foam. Open cell foam has interconnected air pockets that let air flow freely through the material, staying soft, light and breathable. Closed cell foam has fully sealed pockets that trap air inside, making it denser, more rigid and far less breathable.

According to Wikipedia’s technical description of memory foam, the material consists mainly of polyurethane with additional chemicals that increase its viscosity and density, and its cells are open, effectively creating a matrix through which air can move. That is a useful reminder that genuine memory foam, by its original chemistry, was always intended to be at least partially open-celled. The “sleeps hot” reputation that memory foam picked up in the 1990s and 2000s largely came from denser, more tightly-packed foams that behaved closer to a closed-cell structure in practice, even where technically classified as open cell with fewer, smaller interconnections.

In a mattress context, this distinction matters because it directly governs how well body heat and moisture can escape the sleep surface overnight, rather than accumulating against your skin. Closed cell structures are genuinely useful elsewhere, insulation, packaging, waterproofing, but almost nowhere you actually want to sleep.

Foam Cell Structure Explained

Picture two sponges. One has big, connected holes running right through it, so water flows through freely. The other looks similar from a distance but its bubbles are sealed shut, so water just sits on top. That’s roughly the difference between open and closed cell foam at a microscopic level, and it explains almost everything else in this guide.

Foam is manufactured by introducing gas bubbles into a liquid polymer, and whether those bubbles stay separate or merge into interconnected channels determines the final structure. Manufacturers can deliberately rupture more cell walls during production, through modified surfactant chemistry or mechanical processing, to push a foam further towards the open-cell end of the spectrum. This is also why density matters alongside cell structure: a lightweight open-cell foam with poor density can feel breathable initially but wear out faster, while a denser open-cell foam, ideally in the 4-5 pounds per cubic foot range for comfort layers, tends to last longer without losing its breathability advantage. This is a genuine engineering trade-off, not marketing spin, and it’s worth checking density figures alongside any “cooling” claims on a product page.

Open Cell Memory Foam Pros and Cons

Open cell memory foam has become the dominant choice for comfort layers in modern UK mattresses, but it isn’t automatically better in every respect, and a fair assessment means weighing both sides honestly.

On the plus side, open cell foam behaves more like a spring, quickly returning to its original shape after compression because air can flow back into the structure rather than being trapped. It’s noticeably softer and lighter to the touch, conforms well to the body, and its main practical advantage in a mattress is the improved airflow that helps prevent overnight heat build-up. It also tends to off-gas less aggressively when unboxed, since trapped chemical compounds have more pathways to escape.

On the downside, open cell foam is typically less dense and structurally weaker than closed cell alternatives, which can translate to a shorter usable lifespan if the manufacturer has cut corners on density to hit a lower price point. It’s also less water-resistant, since the same interconnected structure that lets air through also lets moisture in more readily, which is why a good mattress protector matters more, not less, with open-cell comfort layers.

Breathable vs Regular Memory Foam: What Actually Changes

“Breathable memory foam” isn’t a strict technical category, it’s marketing shorthand for foam engineered specifically to maximise open-cell airflow, often combined with additional technologies like graphite infusion, gel beads or phase-change materials. Regular, or traditional, memory foam prioritises contouring and pressure relief first, with breathability as a secondary consideration or an afterthought entirely.

Reviewers consistently note that the practical difference shows up most clearly a few hours into sleep, rather than at the moment you lie down. Standard dense memory foam and genuinely breathable open-cell foam can feel remarkably similar for the first ten minutes, since initial contouring depends more on density and firmness than on cell structure. The gap widens overnight as heat accumulates in denser foam and dissipates more readily through breathable, open-cell constructions. Practically speaking, if a product page doesn’t specifically mention open-cell structure, graphite, gel infusion or a cooling cover, it’s reasonable to assume you’re looking at a traditional, denser foam more likely to run warm.

Heat Retention Foam: Why Some Mattresses Sleep Hot

Heat retention in foam mattresses comes down to two separate mechanisms working together: how much air the foam’s cell structure lets through, and how much the material itself conducts or radiates heat. Independent CFM (cubic feet per minute) testing shows standard memory foam allows roughly 30 to 100 times less airflow than natural latex, a genuinely large gap that explains why foam mattresses have such a persistent hot-sleeping reputation compared with sprung or latex alternatives.

Gel infusion typically improves airflow measurements by a factor of three to ten compared with standard foam, but even gel-infused memory foam still sits well below latex-level breathability, since gel primarily addresses conductive heat transfer rather than fixing the underlying cell structure. Genuinely open-cell memory foam closes most of that remaining gap, reaching airflow levels closer to high-resilience polyfoam. In practical terms, this is why the mattresses in this guide combining open-cell chemistry with graphite, gel or spring layers consistently outperform single-technology “cooling” claims that rely on marketing language alone.

Which Foam Mattress Sleeps Cooler?

Hybrid mattresses that combine open-cell foam comfort layers with a spring or foam-spring core consistently sleep cooler than all-foam alternatives, because the coil or spring cavity beneath the foam creates a genuine air reservoir that passively exchanges air as body weight shifts overnight.

This table lines up with real-world testing from independent UK reviewers, who report that graphite-infused open-cell memory foam sleeps noticeably cooler than other memory foam options tested, though synthetic fills remain somewhat less breathable than mattresses filled with natural materials like wool. The practical takeaway is that if temperature regulation is your absolute top priority, a hybrid with genuine spring or coil ventilation will usually beat an all-foam mattress even when that all-foam bed uses top-tier open-cell chemistry.

Mattress Airflow Comparison: CFM and Cover Fabrics

Airflow performance isn’t only about the foam itself, the cover fabric plays a real role too. A dense, tightly-woven polyester cover can meaningfully undercut an otherwise breathable open-cell foam layer underneath, while a knitted, moisture-wicking cover can enhance it.

Testers comparing graphite-cooled hybrids found the covers, while breathable, didn’t wick moisture as aggressively as natural-fibre alternatives, leaving sleepers feeling warm but slightly clammy despite equivalent sweating. This suggests cover selection genuinely matters as much as the foam technology underneath it, and it’s a detail worth checking specifically rather than assuming any “cooling cover” claim is equivalent to another.

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How to Choose an Open Cell Memory Foam Mattress

Choosing between open cell vs closed cell memory foam options gets easier with a structured approach rather than scrolling endlessly through product pages. Here’s the reasoning worth applying, step by step:

1. Check whether “open cell” or “breathable” is explicitly stated. If a product page avoids the phrase entirely, assume standard closed-cell-leaning foam.
2. Look for a secondary cooling mechanism. Graphite, gel, phase-change materials or a spring layer all meaningfully add to airflow beyond foam chemistry alone.
3. Check the cover fabric separately from the foam. A breathable foam under a dense polyester cover loses much of its advantage.
4. Match firmness to your sleeping position, since firmness and breathability are separate variables that don’t automatically correlate.
5. Review the trial period length. Genuine heat retention differences often only become obvious after several weeks of use, not a single night.
6. Weigh density against price. A cheap open-cell foam with poor density may sleep cool initially but sag faster.
7. Check for independent test data, not just brand claims. Retailer and marketplace reviews, alongside independent testers such as Which?’s mattress reviews, offer a useful reality check against manufacturer marketing.

Common Mistakes When Buying a Breathable Memory Foam Mattress

The most common mistake is assuming any mattress labelled “memory foam” is automatically the hot-sleeping kind from a decade ago; construction has moved on considerably, and lumping every foam mattress together means missing genuinely cooler modern options. The second common error is trusting a single marketing statistic, like a manufacturer’s airflow multiplier claim, without checking whether it’s independently verified or simply a brand’s own internal measurement.

A third mistake is ignoring the cover fabric entirely and focusing purely on the foam layer beneath it, when the two work together and a poor cover can undercut good foam. A fourth is skipping the trial period reasoning, buying based on a showroom test that lasts minutes rather than the weeks it typically takes to notice genuine overnight heat differences. Finally, many buyers overlook that a topper can be a genuinely sensible middle step, testing whether open-cell foam suits their sleep before committing to a full mattress replacement.

Practical Usage Guide: Setup, First 30 Nights and Maintenance

Getting genuine cooling performance out of an open-cell mattress starts before you even sleep on it. Unbox and unroll it in a well-ventilated room, and allow the full expansion time stated by the manufacturer, usually 24 to 72 hours, before judging either comfort or temperature. Compressed foam needs time to fully re-establish its cell structure, and judging breathability on night one is genuinely unreliable.

Use a breathable, moisture-wicking mattress protector rather than a fully waterproof plastic-backed one wherever possible, since a non-breathable protector can undo much of an open-cell foam’s advantage by trapping moisture at the sleep surface. It’s also worth keeping the wider bedroom environment in mind: The Sleep Charity’s guidance on sleep environment notes that a bedroom temperature of around 16-18°C supports better sleep generally, and even the most breathable mattress works best alongside a cool room rather than against a warm one. Rotate rather than flip most modern foam-spring hybrids, following the manufacturer’s specific guidance, since flipping an asymmetric mattress can damage the support layers. In the first 30 days, common mistakes include sleeping under too-heavy bedding out of habit, and not giving the mattress a genuine multi-week adjustment period before deciding it “sleeps hot,” since your own thermal adjustment to a new sleep surface takes time too. For ongoing maintenance, vacuum the surface periodically to prevent dust build-up in the open-cell structure, which can gradually reduce airflow performance over years of use.

Real-World Scenarios: Matching Sleepers to Mattresses

If you’re a student in a shared house with a small budget and a bedroom that gets genuinely warm in summer, the Eve Original Hybrid or the Octasmart Deluxe Topper on an existing mattress make more financial sense than a premium hybrid, letting you test open-cell comfort without a big outlay.

If you’re a couple with different temperature preferences, one of you running consistently hot, the Simba Hybrid Pro’s graphite open-cell foam plus spring layer addresses genuine heat retention while its motion isolation prevents a restless partner’s movement disturbing the other side of the bed. If you’re managing joint pain and specifically want the deep, cradling sink associated with classic memory foam without the classic overheating trade-off, the Nectar Premier’s cooling cover over dense contouring foam is the more targeted choice than a firmer open-cell alternative. And if you’re renting and can’t justify a full mattress purchase but are struggling with an ageing, hot-sleeping bed, the Octasmart Deluxe Topper offers a genuinely proportionate solution rather than an expensive full replacement.

Long-Term Cost & Maintenance: Is Open Cell Foam Worth It?

Open-cell foam mattresses generally carry a modest price premium over otherwise comparable closed-cell alternatives, reflecting the more involved manufacturing process required to deliberately rupture cell walls during production. Whether that premium is worth it depends heavily on how much heat retention has actually bothered you with previous mattresses; if you’ve never struggled with sleeping hot, the extra spend may deliver limited additional value.

Where open-cell foam does offer a clearer long-term case is total cost of ownership when it’s paired with adequate density, since a well-made open-cell comfort layer at 4-5 pounds per cubic foot should last comparably to a closed-cell equivalent while additionally avoiding the premature sagging that can come from sleepers overheating and shifting position more restlessly through the night, which itself accelerates wear on comfort layers. Warranty length is a genuinely useful proxy here: manufacturers offering longer cover terms on open-cell or foam-spring hybrid products are implicitly signalling confidence that the added engineering doesn’t come at the cost of durability.

Safety, Certification & UK Regulations Guide

All mattresses sold in the UK, regardless of foam type, must meet flammability requirements. According to GOV.UK guidance on the Furniture and Furnishings (Fire) (Safety) Regulations, businesses may demonstrate compliance with product safety requirements against established standards including BS 7177, which specifically covers resistance to ignition for mattresses, mattress pads, divans and bed bases. This applies equally to open-cell and closed-cell foam products, and it’s a genuinely useful thing to check on a product listing, since compliant mattresses will typically reference this standard directly rather than leaving fire safety unmentioned.

Beyond flammability, look for OEKO-TEX or CertiPUR-style certifications, which independently verify that a foam has been tested for harmful substances and restricted chemical off-gassing, something particularly relevant for open-cell foams given their greater air permeability. Genuine off-gassing, the “new mattress smell,” tends to dissipate faster from open-cell foam precisely because the more permeable structure lets volatile compounds escape more readily, which several reviewers in this guide specifically noted as a practical side benefit rather than just a temperature one.

Frequently Asked Questions

Conclusion

The open cell vs closed cell memory foam debate isn’t really a debate anymore, it’s an engineering decision that the better UK mattress brands have already made, moving comfort layers towards open-cell structures and backing them up with graphite, gel, spring layers or moisture-wicking covers. What still varies enormously is how well each brand executes that shift, and that’s exactly why checking real specs and aggregated review sentiment matters more than trusting a single marketing phrase on a product page.

Across the seven products in this guide, the clearest pattern is that hybrids combining open-cell foam with genuine spring or coil ventilation, like the Simba Hybrid Pro and Dormeo Octasmart Plus, consistently deliver the strongest cooling performance, while budget picks like the Eve Original and the Octasmart Deluxe Topper offer a genuinely sensible lower-risk way to test whether open-cell foam solves your particular overheating problem before spending more. Whichever you choose, checking for BS 7177 fire safety compliance, a genuine density figure, and independent review data will serve you better than chasing the biggest breathability percentage claim on the box.

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