evo.com | O'Neill Full Back Zip 4/3 > Gear up for cold water fun in the O'Neill 4/3 Psycho One Back Zip Wetsuit. Psycho One suits offer O'Neill's premium TechnoButter 3 neoprene in a lightweight, minimal seam-design package with a convenient back zip and super watertight Fluid Seam Welds. When the shoulder season surf is pumping and your warm-water setup just won't cut it, turn to the 4/3 Psycho One and get after it. Z.E.N. Back Zip Zip (back) Entry System with free floating zipper panel and anti-flush barrier with drain hole keeps you warm and unrestricted. TechnoButter 3 O'Neill's exclusive, maximum stretch, hydrophobic neoprene with featherlight ENVY foam rubber core. Ultimate warmth and comfort. Built to last. Double Seal Collar Fully adjustable glide-skin seal is comfortable and watertight. Minimal Seam Design Insane flexibility, fit and durability using a unique design which utilizes larger panels and less seams. Fluid Seam Weld Sealed 8mm silicone-based urethane exterior with a triple-glued and blind stitched interior. Watertight, durable, and ultra flexible seam. | Women's O'Neill 4/3 Psycho One Back Zip Wetsuit 2019