Move with quick efficiency and comfort over difficult trails with a 3D Flex ankle and PU Aircushion midsole when you wear La Sportiva's Trango Trek GTX hiking boots As you get sure footing on wet or slick ground with the Vibram outsoles, you won't be bogged down by heavy, wet shoes thanks to a breathable and waterproof GORE-TEX liner Features: Tread over muddy trails and frosty ground with ease in the Vibram LightRunner outsoles Protect your feet and ankles from abrasion with the 26 mm leather upper that survives tough wear while you keep precip and puddle water out with the DriLex and GORE-TEX liner Stabilize your ankles with the articulating 3D Flex ankle that allows you to flex laterally on rough terrain while providing a lock-out support collar for ascent and descent Protect your arches with the sturdy 7 mm Trangoflex insole with an integral nylon shank and a polyurethane Aircushion in the midsole Don't waste time lacing and unlacing to the low-profile speed-lacing system gives you a quick, dialed-in fit Compatible with strap-on crampons Specifications: Average weight per pair: 2 lb 10 oz Upper: leather to rubberized fabric Midsole: polyurethane Outsole: Vibram rubber Lining: GORE-TEXSpecifications based on size 39