La Sportiva - Nuptse (Ice) - Mens: Double boot for high altitude mountaineering in Nepal, winter volcano trips in the southern hemisphere, or back country split boarding. Half sized shells and inner boots provide a comfortable warm performance fit. Deep lugged La Sportiva MPE outsole gives excellent traction on snow, ice and rock. MPE stands for Mountaineering Performance Evolution. This proprietary sole features a dual-density SBR design, an SBR Aircushion, self-cleaning lugs, and automatic crampon compatibility. Insulated, abrasion resistant upper combines to give ultimate performance in winter conditions.