On approaches with anything from rugged backpacking to fourth-class climbing to water crossings, the Konseal GTX is up for everything. A stiff, stable ride excels across uneven terrain, scree, and snow, even if you&';re hauling a heavy load of gear to the wall. The abrasion-resistant upper utilizes GORE-TEX technology for waterproof-yet-breathable performance in harsh alpine conditions, and a dual-purpose outsole can smear up slabs and descend softer ground with equal confidence. Features & Specs Technical features Durable Stable with heavy loads Footwear construction Compressed EVA midsole provides lasting cushion and support Extended lacing Improved heel hold for precise foot movement and blister prevention Carbon fibre midsole shank adds stability and stiffness needed to handle heavy loads DWR coated over-lasted construction wraps the midsole in an abrasion-resistant compound for added durability Nubuck leather upper with GTX membrane for waterproof, breathable, and durable performance over challenging terrain Forefoot grip for climbing rock and heel traction for hiking down Footwear geometry 4mm lugs Drop (Stack): 11mm (24mm : 13mm) Footwear outsole construction VibramA(R) XS Flash 2 outsole delivers outstanding grip and durable, sure-footed performance across a range of conditions Dual-purpose lugged outsole with a forefoot climbing zone optimized for smearing up rock and separate traction on the heel for hiking downhill Sustainability PFAS (Per- and polyfluoroalkyl substances) Compliant Size 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5,10 Weight (1/2 pair) 365g / 13oz Sizing chart Footwear sizing chart Activity Rock/Boulder Model X000009972