How Does a Cooling Mattress Work? | The 4 Cooling Methods

If you’ve ever woken up in a puddle of sweat, you’re likely wondering about the technology behind cooling mattresses before you buy one. Cooling mattresses tackle heat retention with one or more of four strategies: drawing heat away from the body, dissipating stored heat, increasing airflow, and maintaining a consistent surface temperature. The result is a sleep surface that stays noticeably cooler through the night. Here’s how each method works.

What Materials Actually Pull Heat Away?

Tempur-Pedic’s Pure Cool® and Pure Cool® Plus materials are designed to pull heat away from the body, while a heat-diffusing layer and ventilated foam work together to keep sleepers cooler. The mattress cover is the first contact layer and is meant to feel cool to the touch and draw heat from your skin.

Beneath the cover, heat-diffusing or phase-change materials absorb body heat and release it over time. These materials react within minutes to soak up excess heat, preventing it from building up where you sleep.

Ventilated or open-cell foam adds airflow so warm air doesn’t stay trapped near your body. This is a passive system—it absorbs and disperses heat rather than actively removing it, so its effectiveness can wane through the night.

What Makes an Active Cooling System Different?

Active systems use fans or air channels to move air continuously, which is the most direct way to maintain temperature control through the night.

This mattress features a dual-zone climate control system. Using the remote or Sleeptracker-AI® app, you can set one or both sides of the bed to one of three cooling levels, or use the warming feature before sleep or in the morning. You’ll need the compatible ProSmart® Air Base and power for the fans to operate.

The TEMPUR-ActiveBreeze® product page details the dual-chambered air-distribution layer and Sleeptracker-AI® app control options.

Note: the table above describes passive vs. active approaches generally. Tempur-Pedic’s Breeze collection combines multiple methods, while the ActiveBreeze adds powered circulation.

How Long Does the Cooling Effect Last?

The Breeze cover uses cooling fibers, and the heat-diffusing layer reacts within minutes to absorb and dissipate excess heat. The cooling effect is engineered to last throughout the night, not just for the first hour.

The Canadian ProBreeze product page describes the full feature set.

One common mistake is expecting passive cooling to stay equally effective all night. Passive materials generally absorb and disperse heat rather than actively remove it. If you sleep exceptionally hot, an active system with air circulation provides more consistent temperature control. If you’re comparing options before buying, our reviewed roundup of the best cooling systems for bed narrows down what’s actually worth the investment.

What Are the Practical Limitations?

The removable cover on Breeze mattresses is machine-washable, but the cooling system itself is electronic and mechanical—it’s not meant to be washed. Temperature-control features may not suit every sleeper. People sensitive to powered airflow, warming, or stronger cooling should verify settings before purchase.

Treating a cool-to-the-touch cover as the whole solution is another common mistake. The Breeze line is a layered system, not a single cooling fabric. The cover provides surface cooling while the heat-diffusing layer and ventilated foams handle deeper heat management.