Unique design! Our triple gray rm band biker jacket is made from synthetic PU leather, so it is waterproof, stain-proof, and windproof! Polyester lining. Offset concealed zipper design. Please refer to the size chart for correct fit. Largest size fits a 46" chest. If planning to wear a heavy sweater, order larger please. PU leather, or polyurethane leather, is an artificial leather made of thermoplastic polymer, and is considered vegan.