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What Our Gearhead(R) Experts Are Saying:"This jacket is built for serious mountain adventures. The 3-layer Mammut DRY Tour fabric provides impressive waterproofing and breathability, keeping me dry in harsh conditions. Features like the helmet-compatible hood and harness-friendly pockets make it ideal for climbing, while the underarm vents help regulate temperature during high-output missions. Whether I'm mountaineering or skiing, this shell keeps me protected and comfortable."When we're pushing our limits in the mountains, the Alto Guide HS Hooded Jacket has our back. Designed with a 3-layer Mammut DRY Tour shell, this jacket delivers top-tier waterproofing and breathability, keeping us dry through snowstorms, downpours, and everything in between. Its durable 40D face fabric withstands abrasions from rugged terrain, making it a reliable choice for alpine climbs, ski tours, and technical expeditions. Built for performance, the Alto Guide HS features a helmet-compatible hood, harness-friendly pockets, and underarm ventilation to regulate body temperature when the ascent gets demanding. Pre-shaped sleeves enhance mobility, while the adjustable hem ensures a precise fit. With a 20K water column rating and fully sealed zippers, this shell keeps the elements out so we can focus on the next move.