smartwool merino 150 boxer - men's deep navy, l smartwool super breathable underwear is one of our necessities when we're out adventuring, and that's why we're turning to the merino 150 boxer. it's constructed from a merino 150 blend fabric with the result being a light and stretchy boxer that's ideal for everyday and active wear. merino wool wicks moisture and resists odors so we can stay fresh all day.