O'neill Men's Psycho Tech 3/2MM Back Zip Full Wetsuit O'Neill's Psycho Tech range focuses on ultimate warmth and durability with high-performance recycled materials and water-tight double-sealed stitchless seams. Sustainable TB4 Firewall technology radiates throughout with TB4 Duraskin Air Firewall in the chest and back to shield against the cold while retaining and recirculating your body heat. Designed to keep you in the water longer, toasty, and stoked. Z.E.N. Zip Closure (Back Zip) Redzone Water Resistant Zipper Anti-Flush Barrier (Z.E.N. Zip) Super Seal Cuffs with Plasma Wrist and Ankle Seals Recycled Oyster Shells and Eco Carbon Black Infused Neoprene Recycled Dope-Dyed Yarn Jersey Aqua Alpha Solvent Free Neoprene Lamination Key Pocket with Loop Stitchless Exterior Fluid Seam Weld Technology with Interior Recycled TBX Tape Chest / Back: TB4 Duraskin Air Firewall Thigh / Butt / Shins / Calf: TB4 Firewall Arms / Shoulders: TechnoButter 4 Entry: TechnoButter 4X PLUS (+) = 0.5mm Extra thickness for even more warmth