Plenty of features.
I have two of these shirts (one solid, one plaid), and usually take one to wear for extended trips. Tons of useful features like button-up sleeves, openable mesh back-panel, velcro front pockets. I did cut the secondary zip-pocket off to reduce weight as two pockets are enough for me. I recently wore one for 6-days straight, and it looks brand new after washing. The smalls are a little big for me, but I wouldn't want them skin tight in hot weather.