Quick Answer: A cooling mattress uses materials like gel-infused foam, copper, phase-change fabric, or open coil systems to pull heat away from your body. Innerspring and hybrid mattresses cool best naturally due to airflow through the coils. All-foam beds need active cooling technology. Visit Mattress Miracle in Brantford to test cooling options in person.
10 min read
Why Some Mattresses Trap Heat
Your body drops in temperature as you fall asleep. This is normal and necessary. A study published in the Journal of Physiological Anthropology found that the thermal environment of your bed is one of the strongest factors affecting sleep onset and sleep quality. When your mattress works against that natural cooling process, you wake up sweating.
The main culprit is foam density. Traditional memory foam and high-density polyurethane foam are closed-cell materials. They conform well, but they also trap body heat in those same cells that create the contouring effect. The denser the foam, the less air moves through it, and the warmer you sleep.
This is not a defect. It is simply how foam works. At Mattress Miracle, we are honest about this with every customer who walks in. If you sleep hot, a pure memory foam mattress will probably make it worse unless it has specific cooling technology built in.
The Science of Sleep Temperature
Research published in Sleep Medicine Reviews shows that the ideal sleeping temperature for most adults is between 15.5 and 19.5 degrees Celsius (60 to 67 Fahrenheit). Your core body temperature needs to drop by about 1 degree Celsius to initiate sleep. A mattress that retains heat can delay this process by 20 minutes or more, according to research from the National Institutes of Health. For hot sleepers, this is not just a comfort issue. It affects how quickly you fall asleep and how much deep sleep you get.
Cooling Technologies: What Actually Works
The mattress industry uses the word "cooling" generously. Not all cooling technologies deliver the same results. Here is what we have seen work, and what tends to be more marketing than substance, after nearly four decades of selling mattresses in Brantford.
Gel-Infused Memory Foam
Gel beads or gel swirls are mixed into the memory foam during manufacturing. The gel absorbs heat initially, which gives a cooler-to-the-touch first impression. However, gel foam has a limit. Once the gel reaches body temperature, usually within 30 to 60 minutes, the cooling effect diminishes. Gel foam sleeps cooler than traditional memory foam, but it is not a complete solution for people who consistently overheat.
Our Gel Comfort Memory Foam review covers this honestly. Gel helps. It does not eliminate the problem.
Copper-Infused Foam
Copper is a natural thermal conductor, roughly 400 times more conductive than foam alone. When copper particles are embedded in memory foam, they help move heat away from the sleep surface and distribute it throughout the mattress rather than concentrating it under your body. Copper-infused mattresses tend to feel noticeably cooler than gel alone. Our Sofia Copper-Infused Mattress is a good example of this technology done well.
Phase-Change Materials (PCM)
Phase-change fabrics absorb, store, and release heat to maintain a consistent surface temperature. Think of them as a thermostat for your mattress cover. PCM materials are typically used in mattress covers or the top comfort layer rather than deep in the foam. They work well but add cost and are usually found in premium mattresses.
Open-Cell Foam
Standard memory foam has a closed-cell structure. Open-cell foam has interconnected air pockets that allow air to flow through more freely. This improves breathability compared to traditional memory foam, though it still does not match the airflow of a coil-based mattress. Many modern foam mattresses use open-cell construction as a baseline, with gel or copper added on top.
Coil Systems (Natural Airflow)
This is the simplest and most effective cooling mechanism in any mattress: air. A pocket coil or innerspring core creates hundreds of open channels where air circulates naturally. Every time you shift position, air moves through the coil layer. No technology required, no batteries, no diminishing effect over time. This is why hybrid mattresses and innerspring mattresses consistently outperform all-foam beds in temperature regulation.
Cooling Technology Ranked (Our Honest Assessment)
- Most effective: Coil-based airflow (innerspring or hybrid) combined with a breathable cover. Works all night, every night.
- Very effective: Copper-infused foam with open-cell construction. Noticeable improvement over standard foam.
- Moderately effective: Gel-infused memory foam. Better than nothing, but the cooling effect fades after the first hour.
- Helpful addition: Phase-change cover materials. Good at regulating surface temperature, best used on top of another cooling system.
- Minimal effect: "Cooling" mattress labels without specifying what technology is used. Marketing without substance.
Best Mattress Types for Hot Sleepers
If you sleep hot, your mattress type matters more than any single cooling feature. Here is how the main types compare.
Innerspring Mattresses
The coolest sleeping option. Open coil structures allow constant air circulation. If temperature is your primary concern and you prefer a responsive, firm feel, an innerspring is the most straightforward choice. Read our innerspring mattress guide for a full breakdown.
Hybrid Mattresses
The best balance for most hot sleepers. A hybrid combines a pocket coil base (airflow) with foam comfort layers (contouring). The coils keep air moving underneath while the top layers provide pressure relief. If the comfort layers use gel, copper, or open-cell foam, you get cooling from both directions. Our hybrid mattress collection includes several models designed specifically for temperature regulation.
All-Foam Mattresses
The warmest option by default. If you want an all-foam mattress, look for copper-infused or gel-infused foams with open-cell construction. Avoid ultra-dense memory foam if you sleep hot. A foam mattress with a 3-inch copper gel comfort layer over a firm poly base will sleep cooler than a 10-inch block of traditional memory foam.
Latex Mattresses
Natural latex foam has an open-cell structure with pin-hole ventilation that allows air to pass through. It sleeps cooler than memory foam without needing gel or copper additives. Talalay latex, in particular, has a more open cell structure than Dunlop latex. If you want the conforming feel of foam without the heat, latex is worth considering.
Hot Summers in Southern Ontario
Brantford and the surrounding area regularly see overnight temperatures above 25 degrees Celsius in July and August, with humidity that makes it feel even warmer. Many homes in the region were built before central air conditioning was standard. Customers from Paris, St. George, Cainsville, and Mount Pleasant tell us the same thing: their foam mattress felt fine in October, but by mid-summer they are waking up drenched. If you live in a home without reliable AC, your mattress and bedding choices become your primary temperature defence at night.
Cooling Beyond the Mattress: Bedding That Helps
Your mattress is one layer in a system. What goes on top matters just as much. We have seen customers solve their overheating problem entirely through bedding changes, without replacing their mattress at all.
Sheets
Bamboo viscose and TENCEL (lyocell) sheets are the most breathable options we carry. Both wick moisture and allow air to pass through the weave. Cotton percale is another good option, cooler than cotton sateen because of its matte, crisp weave. Avoid microfiber and flannel if you sleep hot. Our Karira Bamboo Cooling Sheets are our most popular choice for hot sleepers.
Duvets and Comforters
This is where many hot sleepers go wrong. A thick polyester comforter will trap heat regardless of what mattress you sleep on. For summer or year-round hot sleeping, consider a lightweight wool duvet (wool naturally regulates temperature), a down duvet with lower fill power and a breathable shell, or a gel-infused microfiber alternative. Our Gel Microfiber Down Alternative was designed specifically for warm sleepers.
Mattress Protectors
A waterproof mattress protector creates a barrier between you and the mattress. If that barrier is plastic-backed, it will trap heat. Look for protectors made with TENCEL, bamboo, or breathable polyurethane membranes instead of vinyl or PVC. Our Bamboo Shield protector is waterproof without the heat penalty.
Pillows
Your pillow sits right next to your head, the part of your body most sensitive to temperature. Gel-infused memory foam pillows, shredded latex pillows, and buckwheat pillows all sleep cooler than solid memory foam. Our Cool Ice Pillow and True North Cooling Pillow are two of our best sellers for this reason.
How to Choose a Cooling Mattress in Canada
There is no single "best cooling mattress" because it depends on what else you need. Here is a practical framework for deciding.
Decision Framework for Hot Sleepers
- If temperature is your top priority: Start with an innerspring or hybrid. The coil airflow is the most reliable cooling mechanism and it never wears out.
- If you want foam but sleep hot: Look for copper-infused or gel-infused open-cell foam. Avoid traditional dense memory foam. Consider adding cooling sheets and a breathable protector.
- If you share a bed with a cold sleeper: A hybrid with moderate cooling is a good compromise. You can also use different duvets, one lightweight and one warmer, rather than trying to find one mattress temperature that works for both of you.
- If you already own a warm mattress: Before replacing it, try a cooling mattress topper, breathable sheets, and a lighter duvet. Sometimes the bedding stack is the real problem, not the mattress itself.
- Budget under $800: An innerspring mattress will sleep cooler than any foam mattress in this price range. Cooling foam technology adds cost.
What Mattress Miracle Carries for Hot Sleepers
We stock several mattresses specifically designed for temperature regulation. Rather than listing everything, here are the models we most commonly recommend when someone tells us they sleep hot.
The Cool Breeze uses a three-layer cooling system and is one of our most popular choices for hot sleepers. For those who want copper technology, the Sofia Copper-Infused Mattress combines thermal conductivity with antimicrobial properties. The FROST Ice Gel is our most aggressive cooling option for people who truly overheat every night.
For a hybrid approach, the Castille Scott Living Hybrid combines pocket coils with cooling foam layers. And if you want to upgrade your existing mattress, our mattress topper collection includes cooling gel options that can make a significant difference.
We also ship cooling mattresses and bedding across Canada. Our rolled and boxed mattresses qualify for free Canada-wide shipping. For white-glove delivery in the Brantford, Hamilton, Cambridge, and Kitchener-Waterloo areas, call us to arrange setup.
Medical Disclaimer
The information in this article is for educational purposes only and does not constitute medical advice. Night sweats can be caused by medical conditions including hormonal changes, infections, and medication side effects. If you experience persistent night sweats that are not related to your sleep environment, consult your family doctor to rule out underlying causes.
Frequently Asked Questions
What is the best cooling mattress in Canada?
There is no single best, but hybrid mattresses with pocket coils and copper or gel-infused comfort layers consistently perform well for temperature regulation. At Mattress Miracle, the Cool Breeze and FROST Ice Gel are our top recommendations for hot sleepers. The best approach is testing in person, because "hot sleeper" means different things to different people.
Do gel memory foam mattresses actually stay cool?
Gel foam absorbs heat for the first 30 to 60 minutes, creating a cooler initial feel. After that, the gel reaches body temperature and the cooling effect reduces. Gel foam sleeps cooler than traditional memory foam, but it is not as effective as a coil-based system for all-night temperature regulation. Copper-infused foam performs better for sustained cooling.
Can cooling sheets help if my mattress sleeps hot?
Yes, significantly. Bamboo viscose and TENCEL sheets wick moisture and allow airflow that polyester and microfiber sheets block. Pairing cooling sheets with a breathable mattress protector can drop your perceived sleep temperature by several degrees. Some of our customers have solved their overheating issue entirely with bedding changes.
Is a mattress topper enough to cool a hot mattress?
A cooling gel or latex mattress topper can help, especially if your current mattress is otherwise comfortable. It adds a breathable layer between you and the heat-trapping foam below. That said, if your mattress is very dense memory foam, a topper will improve things but may not fully solve the problem. Come to our Brantford showroom and we can help you decide whether a topper or a new mattress makes more sense for your situation.
What is the best duvet for hot sleepers in Canada?
Lightweight wool duvets regulate temperature naturally and work well year-round in Canadian homes. For hot sleepers, a gel microfiber alternative duvet with a breathable cotton shell is a good budget option. Avoid heavy polyester-fill comforters and anything with a non-breathable backing. Our Natura Wool Duvet and Gel Microfiber Alternative are the two we recommend most.
Sleep Cooler Tonight
We are a family-owned mattress store in Brantford, helping our community sleep better since 1997. Come test cooling mattresses, feel the difference between gel and copper foam, and get honest advice about what will actually work for your situation.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001