High-performance technical shell jacket in vibrant lime yellow, designed for extreme alpine and backcountry conditions. Features GORE-TEX Pro fabric with 3-layer construction for superior waterproofing (28,000mm), wind resistance, and breathability. The Alpha SV (Severe) model includes a helmet-compatible StormHood™ with dual-adjustment system, YKK AquaGuard® zippers on all pockets and main closure, and reinforced high-wear zones at shoulders and elbows. Articulated patterning ensures unrestricted mobility during climbing or skiing. Pit zips provide ventilation, while the drop-tail hem and adjustable cuffs enhance weather sealing. Minimalist branding with subtle embroidered Arc'teryx logo on left chest. Ideal for mountaineering, ski touring, and harsh winter expeditions where reliability is non-negotiable. Lightweight yet durable, it packs down compactly for travel. The bright lime yellow offers high visibility in snow or low-light environments, enhancing safety. Constructed with seam-taped waterproof integrity and engineered for long-term durability under abrasive use. Not intended for casual wear but excels as mission-critical outerwear for serious outdoor athletes.