This is a very good boot for mountaneering and ice climbing (with crampon slits), not ideal for expeditions. The sole is Vibram but not the classic one, tougher for me. Very comfortable, they've never injured my feet. Light and warm, don't wear a very thick sock inside when weather is not very cold. Lacing is steel balled down and classic up. Also will be tough them? I don't know yet. Shell is made of two different density plastics, stiff down for climbing with crampons and a soft one up for hiking like with a leather boot. Note: sometimes the rubber on the toecap comes unstuck. Other weak points: shell's black tab is the classic Koflach one, I think a bit feeble; buttonholes inside and outside are a bit feeble too, I´ll verify. Inside boots are made of synthetic perforated leather. Prices are those in Spain.