Sleep experts agree that sleeping in a cool environment helps you fall and stay asleep better. Our body temperature naturally drops when we sleep, a process that starts 2 hours before bedtime to signal melatonin production and tells the brain it's time to rest. When a sleeping environment is too hot, your body's core body temperature is negatively impacted, causing restlessness, decreased sleep quality and restorative sleep function.

Fabric cooling is measured with Q-Max — a physical value that quantifies the sensation of "coolness" when skin touches a surface. For reference, silk scored 0.19 W/cm² while cotton sheets scored 0.11, with the higher the number, the cooler to touch a fabric is. In our Comparative Cooling Experiment, our proprietary Evercool® fabric achieved a Q-Max rating of 0.40 — twice as cool as silk and nearly 4x that of cotton. This leads to a refreshing, instantaneous cooling technology that supports your body's natural body temperature drop for sleep.

The human body is constantly generating heat even in sleep, and traditional bedding like cotton acts as insulators, trapping that heat which can cause night time awakenings. To solve this, our R&D team had to look beyond standard textiles, into the science behind heat and the power of high-thermal-conductivity polymers.

We achieved bedding that would feel like the 'cool side of the pillow' all night long through innovative materials and thermodynamics. The second law of thermodynamics states that heat naturally flows from hot to cold, which we supercharged this concept with our Evercool® fabric, a highly conductive polyamide yarn. Essentially, Rest created a fabric that would move heat away from your body faster, outperforming that of silk, bamboo and cotton to keep hot sleepers cool and comfortable.

We enhanced coolness further for our sheets with silver yarn, which is knitted together with Evercool® fibers. Silver is one of the most conductive elements on earth (429 W/(m·K)), roughly 1,700 times more conductive than standard synthetic fibers like polyester.

The final result is a fabric that doesn't just "feel" cool; it acts as a heat sink, actively pulling excess heat away from your body to dissipate it.

Multiple fibers then form yarn. However, most yarns in textiles are made using a technique called Drawn Textured Yarn, which under a microscope, has a crimped, chaotic texture. The resulting yarn looks and feels rough, with subpar smoothness and thermal transfer properties. Though more technically demanding, Rest utilizes Fully Drawn Yarn (FDY), a more advanced manufacturing process that creates yarns that are straight, uniform and have a round cross section

Our yarn specification is 80D/68F, meaning 68 individual microscopic fibers make up a single strand of yarn, which has a diameter of 80 denier, the same thickness as human hair. These yarns then go through a rare, specialized machine that knits them into a high-density fabric that is durable and machine washable yet feels delicate..

Overheating is a primary cause of waking up in the middle of the night as your body drops its core temperature for sleep. Our bodies sweat when it gets hot to help cool it down, but that is what wakes you up. Rest addressed both these issues by creating a specialized fabric that not only stays cool, but also wicks away sweat for uninterrupted sleep.

Bedding is an ideal breeding ground for micro-organisms that thrive on the warmth, moisture and bodily build up like dead skin cells. To ensure comprehensive comfort, we created the world's first truly antimicrobial bedding.

Incorporating IONIC+™ technology, our Evercool®+ bedding naturally and actively kills microbes to maintain hygiene between washes. We knitted silver yarn that contains positively charged ions directly into the fabric, which stays permanently antimicrobial unlike chemical sprays and coatings that wash away.