Description of La Sportiva Trango Alp GTX Shoes A 3-season alpine climbing and hiking boot. Features: Idro-Perwanger water repellant leather uppers Gore-Tex® lining 3D Flex Ankle™ UPPER: 2.2mm Idro-Perwanger Roughout Leather/ Water-repellant Lorica® with Antiacqua™ external coating/ Vibram® rubber rand CONSTRUCTION: Board Lasted LAST: Trango LINING: Gore-Tex® SOLE: Vibram® Sassalong with Impact Brake System™ MIDSOLE: Micropore (forefoot)/ PU (heel)/ TPU crampon reinforcement in the back INSOLE: mm Trangoflex with integral nylon shank WEIGHT: 26.46 oz/750 gm