Lean, mean, and full of UltraFlex XDS neoprene! The Psycho II Zen-Zip 4/3MM FSW Wetsuit is back, new and improved, with superior warmth thanks to an X-Type, X-Foam Firewall on the chest and back, 2X Fluid Seam Welds that keep you dry as a bone, and a double Superseal neck that keeps it air tight up top, as well. O'Neill even included a drain hole on the Psycho 2 Zen-Zip 4/3 Fullsuit to keep things flowing, so try one today, you won't ever want another suit after taking a Psycho 2 into that freezing water each morning!