A smart and warm solution to double boot dilemmas. Good to 8000 meters and beyond.

If you go where the air is thin and your only heat source burns from within few mountaineering boots fit or serve you better than the double boot La Sportiva Nuptse. Beneath the insulated shell is a warm inner boot made with close cell polyurethane foam and sealed with an internal lace closure system. The inner bootie has tread on the bottom so you can wear it in base camp and never remove it while at altitude. The Nuptse is step-in crampon compatible and sized in half-size increments for optimal comfort.