The Alpha Jacket is a versatile and durable piece from Arc'teryx. The shell is made using N40d Most Rugged 3L GORE-TEX PRO and you've also got Hadron™ 3L GORE-TEX face fabric, which provides weather protection for less weight and increased breathability.The helmet-compatible StormHood™ delivers protection without impacting vision, which is ideal for those who are using this jacket in it's natural habitat - the cliff face. You've also got a RECCO® reflector, which is extremely useful, as it aids search and rescue.Ideal for extreme conditions, the Alpha Jacket is a very, very good investment.This jacket is a regular fit. I'd go for your usual Arc'teryx jacket size.Regular fitN40d Most Rugged 3L GORE-TEX PRO shellHadron™ 3L GORE-TEX face fabricRECCO® reflector hidden in hood brimWaterTight™ external zippersPit zippers for ventilationFull front zip with wind flapInternal zippered pocketTwo external chest pockets with WaterTight™ zippersArc'teryx Nu water repellent treatmentWaterproof and windproofLightweight, durable and breathableArc'teryx branding Arc'teryx Alpha GORE-TEX Jacket Black Sapphire Edziza