Quick Answer: The Cool Breeze is a Canadian-made medium-firm hybrid designed specifically for hot sleepers, combining Cool Max moisture-wicking fabric, a gel phase-change layer, and pocket coils for airflow. It ships free Canada-wide in a box. Best for back and stomach sleepers who run warm. Pricing starts at $585 for Twin.
7 min read
Why Temperature Disrupts Your Sleep
When someone tells us they toss and turn, or wake up at 2 a.m. and can't get back to sleep, temperature is often part of the picture. It doesn't always look like that, people blame stress, or a bad pillow, or the neighbour's dog, but sleep and body temperature are deeply connected.
What the Research Says About Sleep and Temperature
The Canadian Sleep Society recommends a bedroom temperature between 15 and 19°C for optimal sleep. Your core body temperature naturally drops about two degrees Fahrenheit in the hours before and during sleep, a process that signals your brain to release melatonin and enter deep sleep stages. Research published in Frontiers in Neuroscience found that for each 10°C rise in ambient temperature, total sleep duration decreased by nearly 10 minutes, with deep (slow-wave) sleep declining the most. A 2024 study in Nature Scientific Reports confirmed that body cooling significantly increases nocturnal deep sleep, particularly in the second half of the night. The problem for hot sleepers is that their mattress works against this natural cooling process, trapping heat and raising the surface temperature they're sleeping on, preventing the drop that deep sleep requires.
Statistics Canada's 2020 Canadian Community Health Survey found that approximately 50% of Canadian adults report some form of sleep trouble, and that room temperature is among the most commonly cited disruptors. Sleeping hot is a real, well-documented problem, and one that a mattress can meaningfully help or hurt.
That's where the Cool Breeze comes in. Sleep In, a Canadian mattress manufacturer, built it specifically around the hot sleeper problem. Not with one cooling feature, but with three distinct mechanisms layered together.
The Three-Layer Cooling System
Most "cooling mattresses" on the market use a single mechanism, typically a gel foam layer, and market it hard. That works to some extent, but gel alone has a saturation point. Once the phase-change material has absorbed enough heat, it stops actively cooling.
The Cool Breeze takes a different approach: three separate cooling mechanisms that address different parts of the heat problem. Each one works on its own. Together, they're more effective than any single feature could be.
The Three Cooling Layers at a Glance
- Surface: Cool Max fabric wicks moisture away from skin before it becomes a heat source
- Middle: Gel phase-change material absorbs excess body heat as it stores thermal energy
- Core: Pocket coils create open air channels through the mattress body so heat doesn't accumulate below
Cool Max Fabric: The Surface Layer
Cool Max is a polyester fibre with a patented four-channel cross-section. Those channels create a larger surface area per fibre than standard round-cross-section fibres, which accelerates capillary action, the same mechanism that pulls water up through a paper towel. Moisture is drawn away from your skin, distributed across a wider area of fabric surface, and released into the air faster than it would evaporate otherwise.
The same technology is used in performance athletic wear, running shirts, cycling jerseys, base layers worn in high-exertion environments. The application to mattress covers makes sense: you sweat during sleep (most adults lose 200-400ml of moisture overnight), and that moisture sitting against the skin raises local surface temperature.
Cool Max doesn't lower your mattress temperature directly. It removes the moisture that would otherwise become a heat source. Think of it as the first line of defence: reduce the moisture load before it has a chance to warm the surface you're sleeping on.
One important note we tell every customer: put a non-breathable mattress protector on top of Cool Max and you block it. The fabric needs airflow contact with the environment to do its job. We carry breathable mattress protectors specifically designed to work with cooling surfaces, they provide hygiene protection without sealing off the cooling layer underneath.
Gel Phase-Change Material: The Middle Layer
Phase-change materials are substances that absorb and release large amounts of thermal energy as they change states, in the case of mattress gel, transitioning between a semi-solid and a liquid-like state as temperature rises. The gel beads or particles in a mattress comfort layer are engineered to activate at approximately skin contact temperature: around 28-32°C.
The Physics of Phase-Change Cooling
Research published in Springer Nature (2025) found that phase-change materials in foam mattresses have 5 to 14 times greater heat storage capacity compared to conventional thermal materials. When PCM absorbs heat by changing state, it keeps the surface temperature more stable, not dramatically colder, but preventing the progressive warming that happens through the night as body heat accumulates in the mattress surface. A 2020 assessment published in ResearchGate found that PCM mattresses reduced skin temperature increases by 0.3 to 1.0°C compared to non-PCM controls. That may sound small, but in sleep physiology, a fraction of a degree sustained over hours is meaningful for maintaining the deep sleep stages that require a falling core temperature.
Gel phase-change does have a saturation point, once it has stored its maximum thermal load, it stops absorbing actively. For most sleepers on a Cool Breeze, the combination with Cool Max at the surface (reducing heat input) and pocket coils below (allowing heat dissipation) means the gel layer rarely reaches saturation through a normal night. The three mechanisms work together to manage the thermal load rather than relying on any single one to carry all of it.
Pocket Coils: The Airflow Layer
The support core of the Cool Breeze uses pocket coils rather than all-foam construction, and for hot sleepers, this matters more than many people realise.
All-foam mattresses are dense, continuous structures. Heat that passes through the comfort layers enters a solid foam block with no natural pathways for dissipation. It sits there, gradually warming the mattress from the inside out.
Pocket coils are individual steel springs wrapped in fabric, arranged with open space between them. Air circulates through these channels. Heat can move laterally and escape rather than accumulating. This is why innerspring and hybrid mattresses have always slept cooler than all-foam, it's a structural advantage, not a marketing feature.
The pocket coil design also means the Cool Breeze breathes from the bottom, which is why it performs better on a platform base or slatted frame (slats no more than 3 inches apart) than on a completely solid surface that would restrict underside airflow. An adjustable base is also compatible, pocket coils flex well with articulation.
Who the Cool Breeze Suits
Medium-firm is the defining characteristic alongside the cooling features. That means the Cool Breeze works best for back sleepers and stomach sleepers who need firmer support to keep the lumbar spine from arching. Side sleepers of average weight generally find it comfortable; lighter side sleepers sometimes prefer more give at the shoulder.
Good Fit vs. Consider Alternatives
- Good fit: Back sleepers who sleep hot
- Good fit: Stomach sleepers who need temperature regulation
- Good fit: Couples where both sleep warm
- Good fit: Anyone ordering online (free Canada-wide shipping in a box)
- Consider alternatives: Side sleepers who need significant pressure relief at the shoulder, a softer option may serve you better
- Consider alternatives: Heavier sleepers (230 lbs+) who may want firmer coil support
If you're in Brantford or can make the trip, we'd encourage you to come test it. The combination of medium-firm and cooling sounds great in theory, but body weight, sleeping position, and personal temperature sensitivity all interact in ways that are hard to predict without lying on the mattress. That's what our showroom is for, and there's no pressure to buy.
Honest Notes Before You Buy
A few things we think every Cool Breeze buyer should know:
The cooling is real but not dramatic. This mattress will sleep noticeably cooler than most all-foam options. It won't feel like air conditioning. People with extreme heat sensitivity may still want supplementary measures, a breathable duvet, lighter sheet fabric, or cooler room temperature.
The mattress protector you choose matters. A thick waterproof protector seals the Cool Max surface and significantly reduces the cooling effect. A breathable, moisture-wicking protector preserves it. We can show you which options we carry that are designed for this.
Roll-packed expansion takes a few hours. The Cool Breeze ships compressed in a box. Once unboxed, it expands to its full shape within a few hours. Most people sleep on it the same day; we'd recommend giving it a full 24 hours to fully decompress if your schedule allows.
It's Canadian-made. Sleep In is a Canadian manufacturer, and the Cool Breeze reflects that. CCPSA flammability compliance, foam certified to Canadian safety standards. We carry this brand at Mattress Miracle because we've seen it hold up, not because the margin is attractive. Family-owned businesses think differently about what goes on the floor.
Pricing and Free Canada-Wide Shipping
The Cool Breeze is a roll-packed mattress, which means it ships free across Canada. Unlike our in-store white glove delivery service, the box-ship model covers the courier cost nationally, you order it, it arrives at your door, you unbox it yourself.
Current Pricing (CAD)
- Twin: $585
- Double: $625
- Queen: $645
- King: $910
Free Canada-wide shipping included. Call (519) 770-0001 to check current stock or order details.
For in-person purchase and local delivery to Brantford and surrounding areas, you can also visit us at 441 1/2 West Street and take one home, or arrange delivery through us. See our full mattress collection for the complete range of cooling and non-cooling options.
Frequently Asked Questions
How much cooler does the Cool Breeze sleep compared to a regular foam mattress?
Research on phase-change materials shows they can reduce skin temperature increases by 0.3-1.0°C compared to standard materials, and pocket coil construction allows air circulation that all-foam mattresses can't provide. In practice, most hot sleepers who switch from an all-foam mattress notice a genuine difference, fewer night wakings, less sweating, less of the warm-then-damp feeling that disrupts sleep. The effect is real, but if you have severe heat sensitivity, the Cool Breeze should be part of a broader sleep environment strategy (bedroom temperature, bedding choice) rather than the only change.
What mattress protector should I use with the Cool Breeze?
The Cool Max surface fabric works through airflow and evaporation, so a thick, non-breathable waterproof protector will block the effect. Look for a protector with a breathable, moisture-wicking face fabric and a thin waterproof barrier layer. We carry options at Mattress Miracle specifically chosen to work with cooling mattress surfaces. Call us at (519) 770-0001 and we'll point you to the right match.
Can I return the Cool Breeze if it's not right for me?
We'd recommend calling us before ordering to confirm our current return and trial terms, as these can change. Reach Brad directly at (519) 770-0001, he can walk you through what applies to your specific order, including whether an in-store trial is possible.
Is the Cool Breeze good for couples with different temperature preferences?
It helps if both partners sleep warm, or if the warmer partner is the primary concern. The pocket coil construction provides good motion isolation so a partner's movement doesn't transfer. The cooling features work across the whole mattress surface, so there's no "cool side" and "warm side." If one partner is a hot sleeper and the other runs cold, the Cool Breeze will feel neutral-to-cool for both, rarely too cold, but meaningfully less hot than an all-foam option.
Is the Cool Breeze available in Mattress Miracle's Brantford showroom to test?
Yes, we carry Sleep In products in our showroom at 441 1/2 West Street, Brantford. Testing a cooling mattress in person tells you things no online review can: how the medium-firm feel matches your body weight and sleeping position, and whether the surface feel suits you. We're open Mon-Wed 10-6, Thu-Fri 10-7, Sat 10-5, Sun 12-4.
Test the Cool Breeze at Our Brantford Showroom
We are a family-owned mattress store in Brantford, helping our community sleep better since 1997. If you sleep hot and you're tired of waking up at 2 a.m., come try the Cool Breeze in person, feel the difference between one cooling layer and three.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001