I wanted a sleeveless base layer for cycling, but they all cost $30 or more.  I got these for around $10 each, and cut the sleeves off.  I'm 6' 6" 180# so ordered the M and they fit just right.  Be aware that in relation to the expensive base, these are really thin.  Don't know how they will hold up, but so far like them....Wouldn't pay more though.