Arcteryx Alpha SL Jacket - Men's Riptide Medium Made with the lightest and most packable N40r GORE-TEX? fabric with Paclite? product technology Waterproof and breathable while offering a high level of comfort Ideal for climbers and alpinists needing emergency protection in sudden storms Mini ripstop construction provides added tear strength without impacting weight Helmet compatible StormHood? designed to provide the ultimate protection in cold or wet weather