O\'Neill Psycho One 4/3mm Back Zip Wetsuit 2020 in Black/Acidwash The O\'Neill Psycho One 4/3mm back 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 back zip entry gives you easy entry and exit from the suit. 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 Zen Zip Closure System with Drainhole