From the #1 best selling allergy bedding brand, AllerEase Ultimate delivers the clean, healthy night's sleep that we all deserve. Featuring premium materials and an expertly-designed construction, Ultimate prevents unwanted particles from collecting in your mattress. With a soft waterproof layer to protect from spills, stains, and odors, Ultimate also includes specialized seams and zippers making it impenetrable. Together with a temperature balancing finish to keep you cool and dry, a luxurious cotton top, machine washability, and a lifetime warranty, Ultimate offers unmatched comfort, quality, convenience, and value for you and your family.