Layering has always been the secret to a warmer dive. If you stay warm while underwater you get longer bottom times, loose less heat for multiple dives in one day and reduce fatigue and the chance of decompression sickness. The Oceanic Ultra Men's 5/3mm Hooded Vest provides Flexible Layering. The Ultra Hooded Vest Adds-Extra-Warmth on those Cold Days with a Layer of Super Flexible 5/3mm Nylon II Neoprene where you need it most. The Vest has a 3mm Skin-In Face Seal that Cuts-Down on Water Transfer. The Attached Hood Eliminates Cold-Water Leakage into the Suit. Vest is equipped with a One-Way Vent that Eliminate Trapped Air. All Seams are Glued and Sewn for Strength and Durability. Hooded Vest is covered by a 12 month limited warranty.