The Crispi Briksdal Pro SF (Stiff Flex) GTX is the stiffest boot in the Crispi lineup, making it a true mountain boot. With a 10" tall boot there is no need to worry about busted up ankles during long, heavy packouts or in steep broken terrain. The Briksdal Pro also uses an asymmetrical lacing system that allows you to customize the lacing to fit the shape of your foot with a glove like fit & performance. This mountaineering boot is extremely lightweight and is constructed with the highest-quality Nubuk leather on the market. As with all of Crispi's boots, the Briksdal is 100% waterproof.FeaturesUpper: Water-repellent NubuckGORE-TEX Insulated Comfort FootwearInsulation: Gore (~200 g)Insole: Semi rigid structureProtection: Rubber randSole: Vibram sole with dual-densitypolyurethane shock-absorbing midsoleHeight:10"Treatment: Waterproof conditioning cream