DESCRIPTION: For conquering tricky faces, steep vertical and challenging underfoot terrain, the versatile Trango Alpine GTX mountaineering boots are soon to be your go-to. Offering phenomenal stability in climbing and all-day comfort for mountaineering days. Combining classic, comfortable materials with innovative solutions these boots are ideal for adventures taking you to the highest alpine peaks. FEATURES: • Lacing harness eyelets constructed from carbon-filled technopolymer for maximum strength and weight reduction• 3D Flex System EVO™ provides enhanced stability and ankle mobility• Protective side edges made of lightweight PU Techlite™ material• Vibram® Cube EVO outsole tread and Springlug Tech technology guarentees cushioning while remaining ultra lightweight• ePE Gore-Tex® Performance Comfort membrane for reliable waterproof protection and breathability• 100% Trango series DNA for maximum precision when in technical terrain• Compatible with non and semi-automatic crampons SPECIFICATIONS: ITEM: ZFMS090SIZES: 38 - 48 (half sizes)WEIGHT: 23.4 oz (655g)LAST: Trango Ergo • MediumUPPER: 1.8 mm water-repellent Idro-Perwanger® leather / Recycled lace LINING: ePE Gore-Tex® Performance ComfortINSOLE: Hybrid Carbon-Nylon WeaveMIDSOLE: Low density polyurethane with rear TPU insert for crampon attachmentSOLE: Vibram Cube Evo outsole w/ SpringLug Tech and Impact Brake System™ WE RECOMMEND GOING UP A FULL SIZE IN THIS PARTICULAR BOOT AS ALL LASPORTIVA BOOTS TEND TO RUN SMALLER. If you want to talk about these boots, give us a call and we will try to get you the best fit right off the bat as I have worn LaSportiva boots for the last 16 years! VIEW LA SPORTIVA MOUNTAIN BOOT COMPARISON CHART