2XU Women's A:1S Active Sleeveless Triathlon Wetsuit 100% Other Fibers Imported The a:1 sleeveless wetsuit thickness is 4.5mm (smooth skin) in the chest and 1.5mm w/3mm transition zone (Super stretch) in the shoulders. Utilizes a 39 cell front buoyancy panel for maximum buoyancy Floating zip panel provides extra dps (distance per stroke). the zipper has its own panel so it does not inhibit the flexibility in any way. 520% stretch lining for enhanced lateral flexibility Scs (Super composite skin) coating designed to enhances speed through water, durability and flexibility. It's Velocity strakes provide stability for a neutral flow through the water with a more streamlined position and less side to side movement Equipped with a roll bar that wraps around the hips to improved core buoyancy + body position 2 year Warranty with purchase from authorized 2XU seller, 100% Neoprene Velocity Strakes for hydrodynamic stability 39 Cell front buoyancy panel for maximum floatation 2XU's Rollbar technology for enhanced body/hip position for more efficiency and faster swims 2 Year Warranty