PureCare's Cooling Pillow Protector combines our specially designed OmniGuard® Advance fabric with rapid chill cooling fibers—a micarex-based responsive textile with unique cooling properties. FRíO®'s rapid chill cooling fibers disperse body heat throughout the surface of the protector at a rate five times faster than that of regular polyester, focusing solely on heat reduction along the sleep surface through a combination of nano-technology, nylon, and mica minerals. The unique tunneling effect of the mineral-based fiber keeps heat from accumulating in the material surrounding the body, providing a refreshingly cooler sleep surface. FRíO®'s rapid chill cooling fibers are a crushed mineral-infused textile, meaning the cooling effects of this material are literally built into the fabric and will not wash out, lasting the lifetime of the protector. Our pillow protectors feature MiteTight® seams and a locking zipper, providing a physical barrier against allergens, bed bugs, dust mites, stains, moisture, mold, and mildew. Our clinically proven OmniGuard® Advance lightweight performance fabric is approved for all pillow types and won't alter the feel or comfort of your pillow. Our exclusive AirXchange® filter allows air to pass through the pillow protector while filtering out contaminants to keep it cool and to ensure that pillow comfort is not affected. Our pillow covers work with any pillow type, including memory foam, down, gel, or latex pillows. Completely washable, our pillow protectors are specially designed so that you can wash and dry on hot setting for optimal sanitization. PureCare Pillow Protectors conform to strict class one medically recommended allergen standards. 5-year warranty against manufacturer defects.