Sierra Gen II Parka Sierra Gen II Parka Self: 100% polyester Lining: 100% nylon Cuffs: 97% polyester 3% spandex. Made in China. Machine wash. Front zipper and snap button closure. Side slant zipper pockets. Drawcord hood. Side vents with zipper and snap button closure. Ribbed jersey cuffs. ALPR-WO65. WJS52502C1. Since setting up shop in 1959, Alpha Industries has supplied men with the best in military-inspired fashion. Formerly manufacturers of flight and terrain jackets for the Department of Defense, these Alpha Industries takes their technologies and soldier style to better suit the everyday guy.