XCEL 7/6mm Hydroflex UltraStretch Women's Full Wetsuit with ThermoBamboo Lining Back Zipper with adjustable Velcro wrap collar UltraStretch Neoprene XCEL's stretchiest, softest, most durable, and most lightweight neoprene GlideSkin Wrist inner lining in the velcro wrap collar, ankle dams, and wrist seals form an excellent seal against your skin DuraFlex Knee Panels Pre-bent, contoured, articulating knee panels with durable, flexible DuraFlex, which help minimize wear-and-tear