2XU Men's A:1 Active Wetsuit 100% Other Fibers Imported The a:1 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 concave water entrapment zone designed to create more surface area on the forearm, giving more speed in the water enhancing dps. Plus 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