The forecast shows nothing but sun during your alpine trip, but you know better. There's always some rogue cloud that'll pour showers of you for a little bit at least, and it's not like the Mammut Men's Nordwand Light HS Hooded Jacket take up much space in your pack anyway. It packs in a stow bag that Mammut included in the chest pocket, and it weighs less than a half a pound, so there's really no reason to leave it behind whenever you're mountaineering or trekking. Its Gore-Tex Active membrane has better waterproof ratings than most ski jackets, so you know it can handle snow, rain, and brisk breezes. Gore-Tex Active is also exceptionally breathable to ensure comfort when you're working up a sweat on the climb, and Mammut's Vertical Motion and High Reach technologies equip this jacket with climbing-oriented gussets to ensure freedom of movement on the mountain.