Royal Blue Cross Linked Polyethylene Shoe Covers, 18.5" Extra Large, Package of 150 Pairs CROSS-LINKED POLYETHYLENE: These shoe covers are made from cross linked polyethylene. They are lightweight and waterproof. Protects shoes from water, liquids, and light chemicals in work environments. WATERPROOF: These shoe covers are waterproof, and offer the covered area of the shoe protection from splashes and spills. Recommended for use in environments with water and other liquids, and non-corrosive chemicals. CONVENIENT: This product is designed to be a disposable product. Using one-time use products is an excellent way of creating a sanitary work environment .They are lint free and lightweight because they are made of cross linked polyethylene. FITS LARGE FEET: These shoe covers are designed to fit large adult feet, and will fit a variety of sizes. Shoe covers have an elastic around the opening to stretch or conform to many different sizes. SANITARY PROTECTION: These shoe covers are perfect to wear in food services, hospitals, factories, and other institutions to help prevent contamination. Using shoe covers means that staff are able to wear their own choice of comfortable footwear.