O\'Neill Psycho One Mens 4/3mm Back Zip Wetsuit I Acid Wash I 2020 The new O\'Neill Psycho One Mens 4/3mm Back Zip Wetsuit is a top end performance suit that ensures surfers the best of both extreme warmth and flexibility. With quick drying properties, durability features this suit will not only ensure the ultimate surf session but longevity and durability. Created for high performance surfing - being one of O\'Neills top sellers. Being a back zip entry system, this suit is easier to get into as well as quicker to get off. It is light yet fitted, with a double seal collar avoiding water entry or flush in the neck.  Features  100% TechnoButter 3 - this feature ensures the neoprene is soft like \'butter\' - stretching like absolutely crazy as well as the rubber core that ensure quick drying. Anti-Flush Barrier - for less to no water entry.  Double Seal Collar - restricting flush. Minimal Seam Design - light with even more flex.