Scubapro OneFlex wetsuits are for maximize use and function. Made of a strong but stretchable 3mm X-Foam nylon II neoprene rubber with a tough nylon lining and anti-abrasion material on the knees, perfect for an all-round entry-level wet suit. X-Foam Nylon II Neoprene an exclusive Scubapro formula. X-Foam is the only formula which complies with very strict P.A.H. test requirements. P.A.H. (Polycyclic Aromatic Hydrocarbons) is found in many things, including petroleum-based products. Scubapro is very encouraged to be able to offer this neoprene blend in order to better protect divers and our seas. ONFLEX suits offer comfort and long life with intensive use.