The Arc'teryx Alpha SL Jacket is a super light (SL) Gore-Tex Paclite jacket that is also super compressible, and can stay in your pack until the sky opens up, and pours on your adventure. -- Waterproof -- Windproof -- Compressible and packable -- DWR finish (Durable Water Repellent) helps bead water from fabric surface -- Fully seam-sealed for waterproofness -- Helmet compatible StormHood -- Laminated hem -- Harness HemLock(TM) inserts keep jacket in position under harness -- Chest pocket with WaterTight(TM) zip -- Adjustable elastic waist... More