90% M-Flex 1.5mm neoprene/metalite combination long john developed using advanced materials and technology to deliver performance. It features a metalite lining combined with 70% M-Flex neoprene in the chest, back and side panels for maximum stretch and comfort. Specifically designed for women, with a half zip chest entry system, allowing for comfort and a flattering fit. Combine with the Ultimate 1.5mm Neoprene Top for all over neoprene protection or with a rashvest on warmer days.