O’Neill’s PsychoTech combines our exclusive TechnoButter 3 neoprene with TechnoButter Air Firewall insulation, Single Fluid Seam Weld and a F.U.Z.E. Closure Sytem. 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. Psycho Tech Chest Zip 6/4mm Full Wetsuit With Hood | Dark Blue