The La Sportiva Trango Evo S GTX is a revolutionary fusion of ultralight technology and mountain boot protection designed for moving fast and light over technical terrain in the mountains. Backpacker Magazine's Editors' Choice in 2004, the addition of Gore-Tex® represents the EVOlution of this proven design. This is a new generation of mountaineering footwear that changes the old paradigm and redefines what it means to be a mountaineering boot. Features: Innovative 3D Flex™ ankle provides lock-out power for front pointing in crampons, kicking steps in snow or standing on small edges when rock climbing all the while remaining flexible from side-to-side for efficient flat-footing (French) technique on hard frozen snow and soft alpine ice Gore-Tex® lining for waterproof breathable performance coupled with an all synthetic upper keeps you dry when the snow gets soft and sloppy 7mm Trailflex insole with a Dual-density Micropore midsole for the perfect combination of step-kicking rigidity, pack full-o gear stability and twenty-mile 3,000 vert cushioning Vibram® Mulaz sole with Climbing Zone platform for technical rock climbing performance Specs: UPPER: Waterproof Cordura® with idro-treatment/FlexTec2/Water-repellant Lorica® with Antiacqua™ external coating/Vibram® XSV Rand CONSTRUCTION: Board Lasted LAST: Trango LINING: GoreTex® SOLE: Vibram® Mulaz (sticky Supertrek rubber) MIDSOLE: Micropore (forefoot)/PU (heel)/TPU crampon reinforcement in back INSOLE: 7mm TrangoFlex with integral nylon shank WEIGHT: 2 lbs 10 oz SIZES: 36-48 (including half sizes)