O'Neill Wetsuits Men's Psycho 1 4/3 mm Full Suit 4/3mm TechnoButter Neoprene is the most advanced super stretch neoprene; less water absorption with quick dry properties Patented Z.E.N. Zip Entry pullover internal neck seal that blocks out water Single Fluid Seam Weld keeps water from entering at all seams and critical points Ultra Minimal Seam Design for flexibility, fit and warmth Integrated key pocket