Any moisture is quickly wicked away and excess heat or water vapour will pass through the one way semi permeable membrane to prevent over heating. Sharkskin Chillproof is ideal apparel for all water sports including diving, snorkelling, jet skiing, all paddle water sports including SUP, surf ski and outrigger, wind surf and kite boarding, sailing and also as a second layer under wetsuits for surfers and ocean swimmers. Sharkskin's outer layer is a robust, high quality 4 way stretch material with a durable waterproof coating. This Chillproof Long Sleeve Full Zip Top provides the ultimate protection from cold and wind. Sharkskin Women 's Robust Chillproof Long Sleeve Full Zip Sharkskin Chillproof PROTECTIVE OUTER SHELL: The outer layer of Sharkskin's Long Sleeve Full Zip Top is a robust, high quality 4 way stretch material with a durable waterproof coating that prevents water flushing through the suit Sharkskin Chillproof Long Sleeve Step-In for Women (New Release) The Sharkskin Chillproof Long Sleeve Step-In... The 'next to skin' layer is a high tech hollow fibre fleece that retains water when submerged and wicks moisture away on the surface to dry quickly and keep you comfortable. It has a soft neoprene neck seal to help keep wind, water and waves from entering. COMFORTABLE MICRO FLEECE INNER LAYER: The 'next to skin' layer of Chillproof Long Sleeve Full Zip Top is a high tech hollow fibre fleece that retains water when submerged, wicks moisture away on the surface to dry quickly and keep you comfortable John Short-Sleeve Full-Zip Shirt The high loft hollow fleece holds air which your body heats to keep you warm with minimal bulk. The Cannon Single Terminator is a single termination system for one-time equipment severance.Get all your cannon downrigger accessories here Your body heats the water which provides a barrier against the cold water outside of the suit. How does it work? When submerged the hollow fibre fleece is designed to absorb and hold water and prevent water flushing through the suit.