evo.com | O'Neill Full Chest Zip 4/3 > When it comes to plunging yourself in water that average folks deem "psycho," the O'Neill 4/3+ Psycho Tech Chest Zip Wetsuit ensures you stay sane. With an extra 0.5mm of thickness in the extremities for added warmth, plus stitchless exterior fluid welded seams, the 4/3+ Psycho Tech Chest Zip Wetsuit serves as an impenetrable shield against the cold. Comprised of O'Neill's various new TechnoButter 4 materials, plus sustainable neoprene derived from recycled oyster shells and eco carbon, there's only one pyscho move here and that's NOT opting for a trusty suit like this... F.U.Z.E. Chest Zip Closure O'Neill's exclusive F.U.Z.E. (Front Upper Zip Entry) system offers a fresh alternative. Using the same free floating zipper technology as the patented Z.E.N. ZIP closure. The F.U.Z.E. closure keeps you dry and allows unrestricted flexibility. Redzone Water Resistant Zipper Recycled Dope-Dyed Yarn Jersey O'Neill Hyperfreak Fire Series The O'Neill Hyperfreak Fire range focuses on extreme warmth, high performance, increased durability, and comfort. All-new sustainable, buttery soft, heat recirculating TechnoButter 4 materials line each suit. These technologically advanced materials plus water-tight Fluid Seam construction have created a new cold water legend. Fire red-hot heat takes the innovative Hyperfreak legacy to the next level. Recycled Oyster Shells and Eco Carbon Black Infused Neoprene | O'Neill 4/3+ Psycho Tech Chest Zip Wetsuit 2026 - LS in Black | Neoprene