This base layer long sleeve is made of a blend of merino wool and a very lightweight, breathable Dryarn® fiber. This innovative fiber blend results in an extremely quick-drying fabric that ensures excellent temperature and moisture management. The natural antimicrobial characteristics of merino wool prevent the buildup of unpleasant odors on intensely active days. The blend of merino wool and synthetic fibers means the base layer offers more stretch than a base layer of pure merino wool. That makes its close-to-the-body fit more comfortable and also makes it more durably wear-and-tear resistant. The shirt is completely seam-free and therefore feels soft and comfortable against you skin. Combined with the Dynafit Tour Light Merino 3/4 Tights, it offers ideal warmth and is the perfect first layer for ski tours.