Waterproof H1 5/7mm Hood w/HAV System Waterproof H1-5/7mm Hood with Hood Air Venting System (HAVS) Waterproof H1 5/7mm Hood w/Hood Air Venting System (HAVS) Durable Nylon 2 Neoprene Rubber Exclusive Hood Air Venting System (HAVS) HAVS System (double vent valves)