Brookstone Climasure Performance Mattress Pad, Twin, White 20% Cocona/80% Polyester 37.5 technology works to keep the optimum relative humidity in your microclimate so your body more efficiently maintains an ideal core temperature, enabling you to perform better, longer Fabrics made with 37.5 technology dry up to five times faster than similar fabrics, diminishing wet cling 37.5 technology is made with naturally derived materials so there are no harsh chemicals to irritate your skin 37.5 active particles are permanently embedded into yarn and will never wash out or degrade Questions/Comments? Please call our customer service number directly at 888-288-8781.