Zipper closure Quantum Foam Neoprene - light weight & super stretchy Microfleece Lining - fast drying & super warm GBS Sealed Seams added durability & water resistance Duratex Kneepads anti-abrasion but won't inhibit movement GlideSkin Collar anti-rashing & water resistance Hyperflex VYRL 4/3mm Women's Back Zip Fullsuit The VYRL Series is a result of 1000 s of hours of research and testing and a breakout in materials and wetsuit design. Featuring a new strain of Quantum Foam neoprene which is ultra light weight, and feverishly warm. Minimal seam design combined with insanely stretchy rubber create a performance suit that can t be touched. All VYRL suits have a quick-drying micro-fleece lining, providing a soft comfortable fit that conforms to your body.