Durable polypropylene shell prevents tearing and offers maximum flexibility Perfect for surrounding leaking machinery and drains Best suited to surround spills when easy containment and clean up is required Oil only and hazmat socks are made from 100% polypropylene, and absorb more than 25x their weight Universal socks are made from a polypropylene and cellulose blend, and absorb more than 18x their weight Polypropylene and cellulose blend absorption capacities far exceed those of 100% cellulose sorbents Type Socks