The Psycho 1 is minimal seam madness. The ultimate high-performance cold water wetsuit. Built with ultra gooey TechnoButter 2 Neoprene and ultra-minimal seam styling offers unrestricted mobility, enhanced durability and incredible fit. The Psycho 1 will raise your performance level to new heights.3/2mmTechnobutter 2 NeopreneKrypto knee padzStrategic Seamless Paddle ZonesSuper Minimal Seam DeisgnContortionist seamless shoulderPatented Z.E.N. ZIP Closure System with drainholeSingle Fluid seam weldDouble super seal neckPlasma wrist & ankle sealsExternal key pocket with loopSource: www.oneill.com