Cold water is no excuse in this wetsuit. A 5/4/3mm made with Quiksilver FN Lite neoprene means lightweight warmth, while Dry Flight thermal lining adds a little more heat. A Hydrowrap neck closure adjusts to your body, keeping flushes out. And a Hydroshield water barrier keeps water from entering the back zip. The Mens Syncro GBS is serious insulation with lots of stretch.