The Olympus Mons Cube offers maximum warmth and minimal weight for alpinists crossing the coldest, most barren expanses and the highest most extreme mountains on earth. Dual BOA closure system allows you to fine tune the fit. Double removable PE and EVA thermal booties together with the Vibram, LITEBASE and MOREFLEX expanded EVA outsoles insulate and provide comfort and customization. SkiTrab tech inserts make the boot ideal for arctic crossing with skis and skins.-x000D-