The H1 High Visibility Hood features a High Visible Orange coloured surface with reflective patches for ultimate visibility and detection in choppy sea conditions in addition to the standard 10mm double layered protection in critical heat loss areas and glideskin seals for the neck and face. H1 5/10mm HVH includes the unique HAVS (Hood Air Venting System) which uses one-way valves to vent annoying air build-up in the hood. Nylon Imported ANATOMICAL SCULPTING BONDED HIGH QUALITY NYLON THREAD GLIDESKIN SEALS H.A.V.S HOOD AIR VENTING SYSTEM - A unique solution that evacuates air in the hood. With two valves. I-SPAN FOR MAXIMUM STRETCH - Hi quality superstretch I-span nylon. › See more product details