Got it on sale (<$10), but so far I'm thinking it was a great deal even at what appears to be full price (~$14).  They're what I would consider a mid-weight shirt: light enough to use as an undershirt (which I do, because I'd rather sweat into a cheap t-shirt than an expensive dress shirt), but thick enough that get away with wearing it on its own if you wanted.  The size is also great, with enough material to tuck in but not so much that it feels like you're stuffing a dress into your pants.  Would definitely buy again.