The Mesa Falls Wool Long Sleeve Shirt is a lightweight performance Merino wool and nylon jersey blend combining thermoregulation, natural odor resistance and warming properties with the strength of nylon. Engineered stretch provides increased range of movement for optimal flexibility, enhanced by offset shoulder and side seam design to reduce bulk and minimizing seam chafing for extended use. Lightweight performance Merino wool and nylon jersey blend for thermoregulation, natural odor resistance and breathable warmth. 18.0 micron Merino wool. Engineered stretch for increased range of movement. Highly breathable. Offset shoulder and side seams for reduced bulk, improved comfort and easily layering. Regular fit. 78% jersey Merino wool, 22% nylon | 4.3 ounce / square yard; 145 gsm.