Waterproof H1 5/10mm Polar Evoluted Hood w/HAV System Waterproof H1 5/10mm Hood with Hood Air Venting System (HAVS) Waterproof H1 5/10mm Hood with Hood Air Venting System (HAVS) Durable Nylon ll Neoprene Rubber Exclusive Hood Air Venting System (HAVS) HAVS System (double vent valves)