This high-quality anatomical 3D shaped vented hood features a 7mm double layered protection in critical heat loss areas and glideskin seals for the neck and face. Waterproof H2 5/7mm includes the unique HAVS (Hood Air Venting System) which uses one-way valves to vent annoying air build-up in the hood. Features: 3D shaped 100% microcell limestone CR neoprene Glideskin seal HAVS system Super-stretch nylon Bonded high quality nylon thread Reflective logo Extend lining