The Arc'teryx Alpha SL Jacket is a high-performance, ultralight shell designed for alpine and fast-and-light missions. Crafted from durable yet packable N40r-AC ePTFE laminate with GORE-TEX® Pro technology, it offers exceptional waterproofness (28,000mm), breathability (15,000g/m²/24h), and wind resistance while maintaining minimal weight (approx. 290g). This royal blue version features a streamlined, articulated fit with a laminated hood that integrates seamlessly with helmets, adjustable hem drawcord, and two zippered hand pockets with laser-cut ventilation. The iconic white Arc'teryx logo (a fossilized Archaeopteryx skeleton) is embroidered on the left chest. Reinforced shoulders and abrasion-resistant fabric ensure longevity during technical ascents. Ideal for mountaineering, trail running in variable weather, or urban commuting where reliability meets minimalist aesthetics. Its compressible design stows into its own pocket for effortless carry. The jacket balances technical rigor with clean, modern styling—making it equally at home on a glacier or city street. Seasonally versatile for spring, fall, and mild winter conditions, it excels as a protective outer layer over base or mid-layers.