The Mesa Falls Wool Shirt is a lightweight performance Merino wool & nylon jersey blend combining thermoregulation, natural odor resistance & warming properties with the strength of nylon. Engineered stretch provides unrestricted movement with offset shoulder & side seams to minimize bulk & enhance comfort for extended use. Features Regular Fit Lightweight performance Merino wool & nylon jersey blended for thermoregulation, natural odor resistance & breathable warmth 18.0 micron Merino wool Engineered stretch for increased range of movement Offset shoulder & side seams for reduced bulk, enhanced comfort & easy layering