Polyester padded, Showerproof and Windproof To be worn on top of Blazer – Please keep in mind when selecting size.  We recomment going 2-3 inches above existing blazer size for the chest.  Please see grid below for sizing scales. Size Guide = 11-12 (30 chest), 13-14 (32-34 chest), X Small (34 chest), Small (38 chest), Medium (41 chest), Large (44 chest), X Large (47 chest)