O'Neill Psycho 2 5/3mm Wetsuit. The Evolution of Insanity. Known for flexibility and superior fit, the Psycho 2 continues to evolve. The new X-Type firewall, combined with Double Fluid Seam Weld, keeps you warm and loose. The latest from Area 52: Krypto Knee Padz, updated fit in the wrist cuffs, and a clean new graphic package will keep you performing at the top of your game.Double Fluid Seam Weld (stitchless)Patented Z.E.N. Zip Closure System with PulloverBarrier 2 / Double Superseal Neck / DrainholePlasma Wrist and Ankle SealsDouble Super Seal NeckHandcuff Wrist SealExternal Key Pocket with LoopUltraflex Firewall. Measurably Lighter, Warmer and More Flexible100% UltraFlex Xds2x Fluid Seam WeldZ.E.N. Zip Entry with contortionist seamless shoulder (U.S. Patent #5,898,934)Body: 100% UltraFlex XDSChest and Back: Smooth Skin UltraFlex FirewallKnee: KryptoNeck Facing: GlideskinSuper Minimal Seam DesignContortionist Seamless ShoulderLSD: Lumbar Seamless Design