La Sportiva&&';;s traditional mountaineering roots have blended with the innovation of the Aequilibrium Series to develop the Aequilibrium Trek GTXA(R) boot, which is perfect for long treks and backpacking expeditions. A true balance between technical performance and comfort: the sole and midsole construction create a smooth rolling stride and essential support, while the Double Heel(TM) sole lug pattern creates maximum uphill traction and downhill braking for superb grip and performance on technical terrain. Need a wide boot? We have the Danner Crag Rat Evo boots in EE-width. a Exceptional walkability thanks to the innovative Double Heel(TM) constructiona 3D Flex System EVO(TM) directional articulation for contoured, protected ankles: provides stance control and perfect ankle mobilitya VibramA(R) Spring-lug outsole with Impact Brake System(TM) for greater break force control and precisiona ePE Gore-TexA(R) membrane and abrasion-resistant welt to tackle any terrain and extreme weather conditionsa The resoleable tread extends the life of the product and ensures the durability of the sole Specs: ITEM: ZFHS139SIZES: 37 - 47.5 (Half Sizes)WEIGHT: 540 g / 19.0 ozUPPER: 1.6mm Water-repellent Idro-PerwangerA(R) Leather / Mesh Collar & 3D Flex Ankle System Evo(TM) / Recycled Laces / Rubber reinforced toecapLINING: ePE Gore-TexA(R) Extended Comfort / Air Mesh CollarINSOLE: OrtholiteA(R) Hybrid with 5% recycled rubber + 15% production waste foamMIDSOLE: 5mm TPU Stiffener / Polyurethane foam with anti-abrasion TPU filmSOLE: VibramA(R) Spring-Lug w/ PU foam lining and Impact Brake System(TM)LAST: Aequilibrium FIT: MediumPROTECTION: 8/10STABILITY: 9/10STIFFNESS: 8/10