Experience space-like comfort with our innovative Pillow Covers - designed to automatically adapt to temperature changes and provide cool comfort throughout the night. These state-of-the-art covers incorporate multiple layers of advanced Outlast temperature regulating fabric, ensuring that you're always sleeping on the cool side. Simply zip them over your existing pillows and enjoy a comfortable sleep without any fuss. These mini spacesuits for your pillows will revolutionize your sleeping experience. Get them now and enjoy a good night's sleep every night! Why we're different. Traditional bedding and moisture wicking technologies react to changes in your body temperature while you sleep. Slumber Cloud is doing something different. Slumber Cloud Bedding utilizes Outlast technology for an unmatched approach to temperature regulation. Outlast technology is proactive, not reactive. As your body temperature increases during sleep, Outlast technology stores that heat to keep you cool, and then releases it as you cool down keeping you feeling "just right". The thoughtfulness is in the details  It doesn't stop at thread count. It's the little things, the thoughtful details, that make our products the best available. Works Underneath Your Pillowcase: Designed to work even when used underneath your pillowcase Zippered Enclosure: Zippered enclosure transforms your existing pillows into performance "cooling" pillows Easy to care for: Just throw it in your home washing machine Additional Details: Even the hottest of sleepers can stay cool and comfortable all night long. With two layers of Outlast fabric, these cooling pillow covers will help keep your head at the perfect temperature all night while complementing the other components of your Slumber Cloud sleep system. Single Pack includes one pillow cover. Two Pack includes 2 pillow covers 300 thread count - 40% NASA-engineered Outlast viscose / 60% cotton top cover for peak breathability and temperature-regulation Oeko-Tex Standard 100 Certified Technology Features: 300 thread count - 40% NASA-engineered Outlast viscose / 60% cotton top cover for peak breathability and temperature-regulation Oeko-Tex Standard 100 Certified Technology Works Underneath Your Pillowcase: Designed to work even when used underneath your pillowcase Zippered Enclosure: Zippered enclosure transforms your existing pillows into performance "cooling" pillows Easy to care for: Just throw it in your home washing machine Slumber Cloud Outlast Core Pillow Covers - Single King/White