This 1 piece, back zip design suit has HECS StealthScreen technology built in with the addition of Chillproof fleece for extra warmth. Designed to provide full body protection from the cold, sun and marine stingers with HECS technology to allow you to get closer to marine life. It can be used under an existing wetsuit for extra warmth or can completely replace your wetsuit in warmer waters. It is less buoyant than neoprene so you need less weight, making you more comfortable when snorkeling or diving.