SEAC Python Plus Neoprene Wetsuit Jacket, Black Jacket 7mm and 5 mm; Outer lining: superelastic Extraflex nylon of the latest generation. Inner lining: smooth, open ''CEll'' cross-section. Cutting-edge neoprene to ensure the highest possible level of elasticity. Closing system for wrists, ankles, and face in ssRs (smooth skin Round seal). plenty of reinforced sternum protection with protective cushions in neoprene.