The MST Breathelite 1/4-Zip Camo Hooded Base Layer is an athletic and technical layer made from 91% Polyester and 9% Spandex Fleece, providing a 4-Way Stretch for improved mobility. With its improved, super-soft grid-fleece backing and raglan sleeves, you'll get optimal warmth and unrestricted movement. Plus, the vertical zippered chest pocket and the soft hooded design offer additional insulation, making this ideal for cold-weather activities.