The Mesa Falls Wool Long Sleeve 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 increased range of movement for optimal flexibility, enhanced by offset shoulder & side seam design to reduce bulk & minimizing seam chafing for extended use. Features Regular Fit Lightweight performance Merino wool & nylon jersey blend for thermoregulation, natural odor resistance & breathable warmth 18.0 Micron Merino Wool Engineered stretch for increased range of movement Highly breathable Offset shoulder & side seams for reduced bulk, enhanced comfort & easily layering