Velfont Premium 2 in 1-100% Organic Combed Cotton Waterproof and Breathable White Fitted Sheet & Mattress Protector - Twin XL Size Cotton Made with 100% ORGANIC combed cotton super-soft surface and sides, and a polyurethane membrane. This unique product offers a double function: it can be used as mattress protector and as a fitted bed sheet (2-in-1) Its polyurethane membrane makes it 100% waterproof and breathable providing a restful and sweat-free sleep Full protection against dust mites, allergens, bacteria, perspiration, urine and accidental spills (10-Year Warranty) Recommended for asthma, allergy and eczema sufferers. Manufactured according to Oeko-Tex Standard 100, which ensures no harmful substances have been used. Machine wash and dry for an easy care and practical use. It fits as a fitted sheet (elastic all around) adapting to any mattress depth up to 19"