The H1 5/10mm High Visibility Hood features a high visibility orange coloured surface with reflective patches for ultimate visibility and detection in choppy and extremely cold sea conditions. This high-quality anatomical 3D shaped vented hood features a 10mm double layered protection in critical heat loss areas and glideskin seals for the neck and face. Waterproof H1 5/10mm HVH POLAR EVO includes the unique HAVS (Hood Air Venting System) which uses one-way valves to vent annoying air build-up in the hood.