The O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit is one of our top selling wetsuits. It's made with buttery soft TechnoButter 3 neoprene and will keep you toasty warm with its heat-generating TechnoButter Air-Firewall insulating interior jersey. To ensure water stays out it has super seal cuffs, a F.U.Z.E. (Front Upper Zip Entry) closure, and a urethane coated zipper with offset teeth as an anti-flushing barrier. Best of all it was constructed using a stitchless seam technology and a fluid seam weld to keep water out. Stay warm and toasty in any condition with the Psycho Tech.