Arc'teryx Beta Jacket M in Black is a GORE-TEX mountain shell built from an 80D 3L ePE membrane with a C-KNIT backer and PFAS-free DWR finish, in recycled nylon. A low-profile StormHood with a single-pull adjuster, two zippered hand pockets and an internal laminated pocket sit alongside dual lower hem adjusters and an embedded RECCO refle