Mountain life is a four-season sport, one that has us getting after it in all sorts of conditions and environments—and we designed this to be the lightweight midlayer you trust for all of them. Polartec® Power Grid™ fleece uses a raised grid design for more warmth with less bulk, trapping heat when it's needed and letting it out when it's not. Stretch integrated into the fabric moves through your full range of motion, and fast moisture wicking keeps you dry and comfortable. Flatlock seams ensure smooth layering while thumbholes keep sleeves in place, and a concealed zipper pocket on the lower hem stashes small essentials.