This high-quality anatomical 3D shaped vented hood features a 5mm double layered protection in critical heat loss areas and glideskin seals for the neck and face. Waterproof H2 3/5mm includes the unique HAVS (Hood Air Venting System) which uses one-way valves to vent annoying air build-up in the hood. Features: 3/5mm Bibless Version 3D Shaped Anatomical Sculpting 100% Microcell Limestone CR Neoprene Glideskin Seals HAVS Hood Air Venting System (Double Valves) Super-stretch Nylon Bonded High Quality Nylon Thread Reflective Logo Extend Lining Colour: Black