Achieving equilibrium between technical performance and the demands for modern alpinists and mountaineers is a perpetual challenge. The state-of-the-art Aequilibrium LT GTX orchestrates a perfect blend of ultralight construction, durable materials, superlative comfort, and elite performance for moving fast in the mountains. Description Double Heel(TM) increases downhill breaking and promotes fluid strides, reducing muscle fatigue Ergonomic Last wraps the foot allowing for a precise and comfortable fit for all-day wear Rubber Guard(TM) Shell Construction and Internal PU Inserts offer high-cushion and an overall lighter boot 3D Flex Evo(TM) Directional Joint for better support and increased ankle mobility Heel gaiter with integrated puller for an easy and precise fit VibramA(R) Mont Outsole with Impact Brake System(TM) Lugs excels on technical terrain Compatible with various non-automatic and semi-automatic crampons. Crampon compatibility is NOT ensured, and boot-crampon compatibility needs to be inspected Specs ITEM: ZFMS096 SIZES: 36 - 42 (half sizes) WEIGHT: 18.5oz / 525g LAST: Aequilibrium a Medium UPPER: Nubuck Leather / PU-TECH Light Mudguard / Lace Locks / Synthetic integrated tongue with hidden lacing / TPU heel & toe caps LINING: Gore-TexA(R) Performance Comfort INSOLE: Hybrid Carbon-NylonA(R) Weave MIDSOLE: High-Cushion PU Inserts / Rubber Guard(TM) Side Wall / TPU Insert For Rear Crampon Attachment SOLE: VibramA(R) Mont Rubber Compound with Impact Brake System(TM)