The Rab Kinetic Alpine Stretch pant uses zipped hem gussets that adapt to either a ski boot or a mountaineering boot, so the same pair works across alpine ascents and ski touring rather than needing a dedicated pant for each. A four-way stretch Pertex Shield Air fabric breathes more as effort increases, so a hard push up a skin track or a steep scramble doesn't mean overheating halfway through. Inner leg gaiters and hem reinforcements hold up against crampons, rock, and rugged terrain underfoot. What Our Gearhead(R) Experts Are Saying:"I wore the same pants skinning uphill on Saturday and scrambling on rock the next day, just swapping which boot I zipped the gusset over. Not having to pack a second pair of pants for two different objectives is the reason these live in my kit all season."