Mountain Hardwear Advance Zip Long Sleeve synthetic In addition, this long sleeve tee has a stand up collar to keep you protected from the elements. Designed to wear as a layer under your ski Jacket or alone in warmer temperatures, the Advanced Zip Long Sleeve Tee contains moisture wicking and odor-resistant technologies. This tee is made from 100% polyester fabric and is available in sizes XS through XL. (This tee contains a snug fit.) The Mountain Hardwear Woman's Advanced Zip Long Sleeve Tee has a two inch stand up collar and seven inch front zipper.