O\'Neill Psycho One 4/3 Chest Zip Men\'s Wetsuit 2020 - Dark Olive The O\'Neill Psycho One 4/3mm chest zip wetsuit is all about performance and flexibility in the water. The minimal seams is designed to give you unbelievable movement and this year O\'Neill have introduced the all new Technobutter 3 neoprene which makes the suit lighter with the most amount of flex you will ever find. When you put the suit on It really does feel like you are wearing nothing, it\'s that good!! The chest zip entry gives you even more movement as you have no back restrictions. The introduction of the Technobutter 3 gives you most flexible and warm suit which will be a game changer in all wetsuits. Being a 4/3mm wetsuit this is perfect for someone that tends to go in UK waters from the months of April till January  FEATURES Double Super Seal Neck Single Fluid Seam Weld (Watertight Technology) TechnoButter 3 Hydrophobic Neoprene Super Minimal Seam Design Krypto Knee Padz External Key Pocket with Loop Plasma Wrist and Ankle Seals Contortionist Seamless Shoulder Strategic Seamless Paddle Zones F.U.Z.E Zip Closure System with Drain hole F.U.Z.E ENTRY CLOSURE SYSTEM: Uses the same zipper technology as our Patented Z.E.N Zip Closure keeping you dry without restricting flexibility. SINGLE FLUID SEAM WELD: Keeps water from entering at all seams and critical points. MINIMAL SEAM DESIGN: Insane flexibility, fit and warmth using a unique design which utilises fewer seams and giant panels.