The women's Alpha SL Jacket is a super-light GORE-TEX and PacLite tech shell. It's a packable, waterproof, and breathable fabric, durable enough to wear climbing and hiking. 1.6 mm micro-seam allowance reduces bulk without sacrificing strength, while GORE seam tape improves the weatherproof seal. e3D technology patterning makes a trim, clean, activity-friendly fit, weighing only 365 grams. The jacket is an ideal companion on Rocky Mountain climbing trips and day treks around eastern Canada's National Parks. Removable HemLock inserts secure the jacket to your harness. Arc'teryx also equipped it with a helmet compatible StormHood, adjustable and designed to move with your head when worn over your helmet. The front and exterior chest pocket have WaterTight zippers. A stuff sack is included; when packed, the jacket takes up less than 1cL of space and can be clipped to your backpack when out climbing or cycling.