Arc’teryx Proton LT Hoody - Women’s Medium Black Gently used but in fantastic shape The Arcteryx Arc'teryx Proton Lt Hoody Women's is a breathable and warm jacket that is designed for climbing and dynamic mountain activities in cold conditions. It is made with 100% recycled PrimaLoft Gold insulation that is light and packable, and performs even if wet. The outer is a durable, air-permeable Fortius Air 20 softshell. It also has an insulated StormHood that extends coverage, and an articulated design that is patterned to move. The jacket has a full length no slip front zipper, two zippered hand warmer pockets, and an insulated low-profile under-helmet adjustable hood