The Smartwool Alpine Trace Active Short-Sleeve Graphic T-Shirt blends merino wool with recycled polyester, so the fabric manages moisture, regulates temperature, and resists odor on its own rather than needing an added treatment. Offset shoulder and side seams keep the fit smooth against the skin, cutting down on chafing whether the day includes a trail or just a couch. A regular fit leaves room to move without adding bulk.