Our #910 blue shoe covers have a non-skid bottom and an elastic edge. They are made from polypropylene and are fluid resistant. They can be purchased in boxes of 10 pairs or by the case of 150 pairs. Fits up to at least a size 13. Great protection for the shoe, can be used for home tours, cleaning services, service workers, anywhere you want protection for your carpets and hardwood floors. These come in two sizes; large and extra large.