Mammut M Winter Zip Longsleeve ShirtThe casual plaid shirt is one of our traditional all stars. The new version is made with a fabric blend of recycled polyester and viscose but is still at least as soft and comfortable as its predecessor. Its suitable for hiking, climbing and everyday wear. Instead of traditional buttons, the zipper gives the Winter Zip Longsleeve Shirt a casual look that is a hybrid between a shirt and lightweight jacket. Simply put it on over what you already have