Yamamoto Grade 39/45 100% CR neoprene Outer 100% impermeaflex lamination for ultra 4 way stretch Super Flexible/Comfortable Nylon lined-15mm Open Cell-3.5 & 5mm Inner Titanium Oxide (Grade Silver) lined -7mm Antibacterial properties Low Friction-reducing muscle fatigue Double clip system Beaver tail-2pc suits Built in loading Chest pad Reinforced knees and rear Vented hood releases excess air WHY YAMAMOTO NEOPERENE? Made from eco-friendly limestone based polymer with a 99.7% calcium carbonate concentration. Hydroelectric power used to process is one tenth of that being used for refining petroleum based neoprene products, minimizing the release of greenhouse gases. The highest/finest grade neoprene available