O'Neill Men's Psycho Tech 4/3+ Back Zip Fullsuit Wetsuit Features:O'Neill's Psycho Tech combines our exclusive TechnoButter 3 and added heat-generating TechnoButter Air-Firewall. It's offered in a wide range of styles with the hi-tech features you need to stay warm and toasty in any condition.Z.E.N. Zip Closure (Back Zip)Redzone Water Resistant ZipperAnti-Flush Barrier (Z.E.N. Zip)Super Seal CuffsStitch-less Seam TechnologyFluid Seam WeldArms/ Shoulders/ Shins/ Calf: TechnoButter 4Chest/ Back: TechnoButter 3 Air-firewall SmoothskinThigh/ Butt: TechnoButter 3 FirewallPlus (+) = 0.5mm Extra thickness for even more warmthAqua Alpha Solvent Free Neoprene LaminationITEM # 5335-A00