At O'Neill's PsychoTech with FUZE closure system we combine our exclusive TechnoButter 3 Neoprene with TechnoButter 3 Air Firewall Insulation, Stitchless Seam Technology with Single Fluid Seam Weld outside and TB3X Tape on the inside. This makes the wetsuit lighter, warmer, dries faster and is easy to put on. PsychoTech combines the latest technology for cold water wetsuits and is the result of more than 60 years of innovative wetsuit development.