The O'Neill Psycho Freak 4.5/3.5mm is the ultimate in the winter. Read more
O'Neill's XDS-Air Insulated Neoprene features a complex 3D structure of rubber and trapped air components. Combine XDS-Air with all the insane features of the O'Neill Psycho 2, and you have a wetsuit ready for the harshest conditions. This suit is super-stretchy, but will give you the equivalent warmth of a 6mm suit. With a new Firewall which is more insulative, and now comes in the chest and back as well as the lower core panels, you'll stay warmer for longer.