THE NAME SAYS IT ALL O'Neill's New Psychotech Series combines our exclusive TechnoButter neoprene with TechnoButter-Air Firewall insulation, single Fluid Seam Weld and F.U.Z.E Closure System. Lighter, warmer, more insulating and quick drying with improved ease of entry. Psychotech is the latest advancement in cold water wetsuit technology from the leaders in innovation for over 60 years. * F.U.Z.E. CLOSURE SYSTEM (FRONT UPPER ZIP ENTRY) Uses the same zipper technology as our Patented Z.E.N. Zip closure keeping you dry without restricting flexibility. * TECHNOBUTTER & TECHNOBUTTER-AIR FIRWALL NEOPRENE The most advanced super stretch neoprene available on the market. 20% Lighter, 30% less water absorption with quick dry properties * SINGEL FLUID SEAM WELD Keeps water from entering at all seams and critical points. * SUPER SEAL CUFFS O'Neill's new Super Seal Cuff is fused to create a very low profile at the cuff ending creating the best seal ever.