Tilos 7/5mm Titanium Semi-Dry Seal Scuba Full Wetsuit J7058 and J7158 Mens and Womens Tilos 7/5mm Titanium Semi-Dry Scuba Diving Wetsuit. 7mm neoprene covers the chest and back for additional warmth 5mm neoprene in the arms and legs for added range of motion Titanium coated neoprene offers 25% better insulation than standard neoprene