SOMNUS Sleep Comfort Series Mattress Protector, Hypoallergenic, King cotton_blend Imported 80% cotton / 20% polyester blend - won't change the feel of your mattress Protects against dust mites, fluids, urine, perspiration, allergens and bacteria Hypoallergenic cotton terry surface with membrane back coating (waterproof, noiseless and breathable) Great for those with kids, pets, allergies, asthma, eczema or incontinence Fitted sheet style design