O'Neill Wetsuits Men's Psycho 3 3/2mm Full Suit 3/2mm TechnoButter Neoprene body, XDS-AIR Firewall Neoprene Chest TechnoButter Neoprene is the most advanced super stretch neoprene; less water absorption with quick dry properties Thinner and Lighter Double SuperSeam Weld (Watertight Stitchless Technology) SuperSeal Neck and Cuff create the best seals ever Patented Z.E.N. Zip Entry pullover internal neck seal that blocks out water for maximum performance