O'Neill Wetsuits Men's Heat 4/3mm 3Q-Zip Fluid Seam Weld urethane 4/3mm 100% UltraFlex Neoprene forfit, function, and flexability Exterior Fluid Seam Weld Construction, Double Super Seal Neck Strategic Seamless Paddle Zone Firewall X Type Interior Chest and Lumbar Urethane Coated Covert Code Red Back Zipper keeps water from entering