Did you know that 37.5 degrees Celsius is your body's perfect temperature? Get the best of both support and comfort with this Great Sleep pillow made with 37.5 technology. Our new and exclusive 37.5 Technology Bedding continuously adjusts to maintain a micro-climate of personal comfort for you. It dynamically maintains the relative humidity inside the bedding micro-climate surrounding you at 37.5% & also keeps your core body temperature around 37.5 Celsius (which is the human body's peak performance state) all night long - so you can sleep deeper and wake up rested and refreshed. It does this using activated carbon particles derived from volcanic mineral & natural coconut shell fibers. These particles are embedded in the bedding permanently and cannot be washed out. The system adapts to how you sleep and works non-stop to keep you cool if you feel too warm and warms you up if you feel too cold. The smooth and soft 300-thread count cover is made from a blend of 80% cotton and 20% 37.5 infused polyester and has a lofty, supportive fill of 80% TRILLIUM micro-denier and 20% 37.5 infused polyester fiber.