For those times when a rain hat is just the ticket but you didn't want to lug a traditional sou'wester, the Pileus does the job. At just over an ounce, the Pileus offers the protection of 1.1 oz silicone impregnated rip-stop nylon in an abbreviated sou'wester style that includes a mylar reinforced brim, and features a gust proof retainer with cord lock.