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® technology • Breathability for balanced heat and humidity • Hygienic, washable, antibacterial, and odor-free Learn more about Pillow Protector here