Our pillow protectors use a special material, like what astronauts wear, to keep your temperature just right when you sleep. Feel too warm? Simply switch to the cooler side of the pillow protector. Need a bit more warmth? Flip it back. Beyond the immediate comfort, this innovative feature is designed for longevity. Durable and tested, these protectors maintain their effectiveness wash after wash.* Features Outlast(R) technology* Breathability for balanced heat and humidity* Hygienic, washable, antibacterial, and odor-freeLearn more about Pillow Protectorhere