Designed by a doctor, our bed topper is the perfect allergy free bedding accessory that provides extra comfort and support without irritation Achieve healthier sleep with an overstuffed mattress topper and brushed microfiber shell; traditional down feathers can harbor dust mites, mold, and mildew, triggering allergy and asthma sufferers Box stitched for durability to prevent shifting and clumping, our extra deep mattress pad fits mattresses up to 18 inches in height, with the 2-way stretch fabric ensures a snug fit