This medium-weight, long-sleeve shirt has some bamboo fibers mixed into the fabric blend for a soft feel and odor fighting properties. The sleeves are a little longer than normal so the thumbhole is more functional to get the sleeve further down on the wrist for better sun protection. A bonus to the womens model of the Canopy Shirt is the attached hood, which is mostly about adding style, but its a nice thing to have when the ears start glowing red from the cold.