This 4 in 1 Jacket is waterproof, and breathable. The outer jacket has sealed seems, stand up collar, adjustable wrist closures and an elastic waist band. The inner Jacket is reversible and features a stand up collar, ribbed cuffs, elastic waist and a self locking zipper. The shell and lining are made of Polyester Tricot and the insulation is 4 oz. of Polyester Fiberfill.