These refills for the BootieButler's automatic shoe cover dispensers slip-resistant. Each cover is made of spunbond polypropylene, anti-static material with non-skid and non-conductive soles that a durable yet lightweight. The tops have a strong elastic band that allows for a one-size fits most that fits up to a men's size 15 shoe. The shoe covers come in bundles of 40 pairs, with 15 bundles in a case (totaling 600 pairs).