La Sportiva N.A. Men's Trango Extreme Evo GXT Mountaineering Boot Reviewhttp://tinyurl.com/nqfyg2r La Sportiva N.A. Men's Trango Extreme Evo GXT Mountaineering Boot SyntheticUpper: Energy saving, lightweight water-repellant Cordura with idro-treatment and FlexTec 2, water-repellant Lorica with Antiacqua external coating, durable Double Vibram rubber randInnovative 3D Flex ankle provides optimal upper hingeGORE-TEX Duratherm lining gives insulated waterproof warmthVibram Lavaredo (Sticky Supertrek Rubber) outsoleInsulating 9mm Ibi-Thermo insole adds warmth