The Psycho One surf wetsuit from O'Neill offers you an unparalleled premium suit with lightweight flexibility. Patented Z.E.N. zip closure (Back Zip). Anti-Flush Barrier (Z.E.N. Zip). Minimal Seam Design. Seamless Paddle Zones. Plasma Wrist and Ankle Seals. Krypto Knee Padz. Fluid Seam Weld. Full Body: TechnoButter 3. 3mm in torso, 2mm in arms and lower legs.