Sharkskin Men's Chillproof Undergarment JumpsuitThe Sharkskin Undergarment is designed for use under a Drysuit for warm and temperate waters and can be layered with another undergarment for extra warmth in cold waters. Under a Drysuit the next to skin hollow fibre fleece traps and holds air which your body then heats up to provide an insulation layer. The front entry zip makes the suit easy to get on and off, with the mens version also including a convenient 2 way comfort zip. The Chillproof