100% Oystex Recycled Polyester (275 GSM) Eco-Friendly Water-Resistant Rain Shell'. 10,000 mm water proof rating. Waterproof welded zippers. Elastic drawcords.  Made with Oystex technology, The Oyster Shell combines oyster shells and recycled polyester in this ultra- durable ripstop fabric. Features waterproof welded zippers, Velcro cuffs, elastic drawcords with embedded clasps at hood and waist. The special welded membrane and DWR coating combines to achieve a 10,000 mm water proof rating. It'll keep you dry in the wettest of conditions.