For best-in-class performance in the most challenging alpine conditions, rely on The North Face Mens Verto S6K Glacier GTX mountaineering boot. 6K refers to 6,000m where this boot is destined for use. A high-cut, crampon compatible mountain boot with superb Italian craftsmanship, it features Gore-Tex total waterproof and breathable protection as well as ample Primaloft insulation, plus Cradle technology that facilitates supreme stability and impact cushioning in every stride. Features Best-in-class, full-crampon mountain boot with Italian craftsmanship and European build features waterproof, breathable GORE-TEX performance PrimaLoft insulation CRADLE technology to deliver maximum performance and confidence for glacier travel GORE-TEX waterproof, breathable membrane Smartlite PU mudguard Northotic Pro+ premium EVA footbed with gel heel and OrthoLite forefoot-cushioning pads and TPU Cradle support Stainless steel upper eyelets and locking instep eyelet TPU CRADLE heel-stability technology with crampon spoiler BASF Agile PU body and EVA heel cushioning