The Merino Wool Plus Light Long Sleeve Tees are the perfect intersection of wool and performance. These shirts are a comfortable fit. They are perfect alone or layered in cool weather, yet comfortable on warmer days as well. They can’t be beat for alpine ascents where thermoregulation is key. Wool is my preferred fabric for hiking and running because of its anti-odor properties and comfortable feel against the skin. The addition of polyester to the Plus Light series does greatly increase the longevity of the fabric but does slightly affect the overall anti-odor capabilities of the fabric. I will be climbing mountains in these shirts for a long time!