Wool is an active fiber with the ability to regulate your body temperature. It keeps you warm when it’s cold and cools you down when it’s hot. When the body temperature rises wool wicks away the moisture from your skin to evaporate.
Sweat itself does not smell. Body odor occurs when bacteria thrive on your skin. The bacteria from sweat prefer a humid environment. Wool fiber’s ability to absorb large quantities of moisture, keeps your skin dry and prevents sweat to build-up. These properties make the habitat less suitable for bacteria.
Wool absorbs UV radiation much more effectively than many other materials. In UPF terms, depending on the density and treatment of the garment, wool apparel usually has a UPF between 20 and 50.