Quick Answer: The best cool memory foam mattress combines open-cell or gel-infused foam with a breathable Tencel or knit cover and a support base that limits deep sinkage. Phase change material covers and copper-infused foams offer the most sustained heat dissipation. Firmness and cover breathability matter as much as the foam itself.
In This Guide
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Waking up overheated is one of the most common complaints about memory foam mattresses. The material that makes them so good at pressure relief, its slow-response viscoelastic properties, also traps body heat. But calling memory foam universally hot is no longer accurate. A generation of cooling technologies has changed what the best cool memory foam mattress can deliver.
The challenge is that not all cooling claims hold up under testing. Some technologies work well. Others are mostly marketing. This guide separates the two and explains what hot sleepers in Canada should actually look for before buying.
Why Memory Foam Sleeps Hot
Standard memory foam has a closed-cell structure. Air cannot circulate through it easily. When your body presses into the foam, heat from your skin is absorbed by the material and stays there, creating a warm pocket around your body. The slower the foam responds (the more visco-elastic), the more it wraps around you and the more body heat is trapped.
A study in Sleep Medicine Reviews found that core body temperature naturally drops 1 to 2 degrees Celsius during sleep onset and a mattress that prevents this drop significantly delays sleep initiation and reduces slow-wave sleep quality.1 This makes sleeping cool not a luxury but a functional requirement for quality rest.
The Sinkage Problem
Softer memory foam causes deeper body immersion, which means more foam surface area contacts your skin. More contact means more heat transfer from your body to the foam. A medium-firm mattress (ILD 25-35) limits immersion while still providing pressure relief, reducing heat build-up compared to a very soft memory foam surface.
Cooling Technologies: What Works and What Does Not
Gel Infusion
Gel beads or swirled gel layers are added to memory foam to absorb heat. Research shows gel absorbs heat effectively at first but reaches thermal equilibrium after 30 to 90 minutes, after which it provides no further cooling.2 Gel memory foam is cooler than plain memory foam at the start of sleep but not necessarily cooler through the night. It is a partial solution.
Open-Cell Foam Architecture
Open-cell memory foam removes the walls between foam cells, creating an interconnected structure that allows air to circulate. This is a more sustained cooling mechanism than gel alone. When combined with gel infusion, open-cell foam is among the most effective memory foam cooling options. Look for products specifically labelled "open-cell" rather than just "gel-infused."
Copper Infusion
Copper is a highly conductive metal. Copper-infused foams draw heat away from the body faster than non-conductive materials. Copper also has antimicrobial properties that may extend foam freshness over time. Our Restonic Revive Tiffany Rose uses Talalay Copper Latex in its comfort layer, one of the more effective thermal-management materials available in Canadian mattresses.
Phase Change Material (PCM)
PCM is a substance that absorbs heat as it transitions from solid to liquid at a specific temperature, around 28 to 30 degrees Celsius. PCM is typically applied to mattress covers rather than the foam itself. It provides a notably cool initial feel and sustains temperature regulation better than gel foam. It is the most effective cooling surface technology available in the mattress industry today.
Graphite Infusion
Graphite draws heat away from the body through conduction, similar to copper. It is less common than gel or copper infusion. Performance is comparable to copper with a slightly lower material cost.
| Technology | Initial Cooling | Sustained Cooling | Typical Cost Impact |
|---|---|---|---|
| Standard Memory Foam | Poor | Poor | Lowest |
| Gel-Infused | Good | Moderate | Low |
| Open-Cell | Good | Good | Low-Moderate |
| Copper-Infused | Very Good | Very Good | Moderate-High |
| PCM Cover | Excellent | Excellent | High |
How Firmness Affects Temperature
Firmness is the least discussed but most important variable in cooling. A medium-firm memory foam mattress (ILD 28-35) supports your body near the surface rather than letting it sink deeply into the foam. Less sinkage equals less foam surface touching your skin, which means less heat trapped around your body.
Side sleepers still need pressure relief at the shoulder and hip. For them, a medium memory foam (ILD 20-28) is the target. The goal is to limit immersion below 3 inches while still cushioning prominent pressure points.
Why the Cover Matters More Than You Think
The mattress cover is the first material your body contacts. A dense polyester cover can negate the cooling benefits of the foam beneath it. Covers made from Tencel (lyocell), bamboo rayon, or a knit stretch fabric promote airflow and moisture wicking. Tencel in particular is one of the most breathable textile options and is commonly used in premium mattress covers sold in Canada.
The Restonic Luxury Silk and Wool model uses natural fibre quilting in its cover, which regulates moisture without synthetic coatings. At $2,395 for a queen with 884 zoned coils, it is a good example of how cover materials contribute meaningfully to sleeping temperature, not just the foam below.
What to Look for at a Canadian Mattress Store
When shopping for the best cool memory foam mattress in Canada, ask the following questions:
Questions to Ask In Store
- Is the foam open-cell or closed-cell? Open-cell is meaningfully better for airflow.
- What is the ILD rating of the comfort layer? Aim for ILD 20-35 for most sleepers.
- What material is the cover made from? Tencel, bamboo, or knit fabrics outperform polyester.
- Does the comfort layer include PCM, copper, or gel infusion? These are the meaningful cooling additions.
- What is the support core? All-foam or hybrid with coils? Coil bases add airflow from below.
A bedroom mattress set that includes a proper foundation matters too. A slatted base with gaps under 3 inches promotes airflow under a foam mattress, preventing heat pooling from below. See our guide to bed foundations for memory foam mattresses for what base specifications to look for.
At Mattress Miracle in Brantford, our team can help hot sleepers test surface temperature differences between models using real sleep positions. We have been fitting Brantford families since 1997 and know which products actually deliver on their cooling claims.
Bloom Air mattresses are inflatable beds marketed as eco-friendly alternatives to traditional air mattresses, with plant-based materials and recycled components. Mattress Miracle at 441½ West Street in Brantford notes that inflatable mattresses serve a purpose for camping and temporary guests, but should not be used as a primary sleep surface. Brad recommends a proper mattress for nightly use and an air mattress only for occasional guests. Call (519) 770-0001.
Shop: Foam Mattresses at Mattress Miracle
Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1997. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
Does gel memory foam actually sleep cooler?
Gel-infused memory foam sleeps somewhat cooler than standard memory foam by absorbing heat initially, but studies show the gel saturates within 30 to 90 minutes and stops providing additional cooling. Open-cell foam architecture combined with a breathable cover tends to deliver more sustained temperature neutrality.
What is the coolest memory foam mattress technology?
Phase change material (PCM) covers and copper-infused foams provide the most sustained cooling. PCM absorbs heat as it changes state, smoothing out temperature spikes. Copper conducts heat away from the body faster than gel. Both work best when the foam below has open-cell architecture for airflow.
Can a memory foam mattress be too hot to sleep on?
Yes. Standard closed-cell memory foam restricts airflow and traps radiated body heat. If you consistently wake up hot, a mattress with poor breathability or one that is too soft (causing deep immersion) is likely contributing. A firmer surface reduces immersion and body heat build-up.
Is latex or memory foam cooler?
Latex generally sleeps cooler than memory foam because of its open-cell structure and pinholes that allow air circulation. However, gel-infused or copper-infused open-cell memory foam can perform comparably to latex for most sleepers.
What mattress is best for hot sleepers in Canada?
Hot sleepers in Canada should look for open-cell or gel-infused memory foam, a breathable knit or Tencel cover, and a support layer that does not trap heat. Hybrid mattresses with a thin memory foam comfort layer over a coil base also work well because the coil base promotes airflow.
Sources
- Okamoto-Mizuno K, Mizuno K. (2012). Effects of thermal environment on sleep and circadian rhythm. Journal of Physiological Anthropology, 31(1), 14. doi.org/10.1186/1880-6805-31-14
- Fountain CL, et al. (2019). Phase change materials in mattresses for hot sleeper comfort. Journal of Thermal Biology, 82, 201-207.
- Lahm R, Iaizzo PA. (2002). Physiologic responses during rest on a sleep system at varied degrees of firmness. Ergonomics, 45(11), 798-815. doi.org/10.1080/00140130210159543
- Health Canada. (2022). Indoor Air Quality and Sleep Environment. canada.ca/health-canada
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle — 441½ West Street, Brantford, ON — (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.
If heat is your main sleep problem, come in and test cooling mattress options side by side. We can show you the real difference between a gel-infused and an open-cell model on our showroom floor.