Sooruz GURU+ 6/5/4MM OYSTERPRENE CHEST-ZIP Our warmest wetsuit combining performance eco-friendliness and warmth.Made of Oysterprene Y7 our softest and lightest material. It’s covered with polyester and recycled nylon fabric all water-laminated for high performance. Oysterprene: foam made from oyster shell powder.- Integrated Hood with Storm Dry lining to keep your even warmer during winter sessions….