These are the perfect workout shirt.  It's not tight or unflattering. True to size--I usually wear a medium, and the medium fits--it is naturally loose though. Plus, you could be sweating up a storm but the shirt shows barely any wetness.  The only thing is my heather gray one now has armpit stains after a while of use.  Its too bad because the shirt itself is still in great shape (I just don't like wearing it in public).  I love the color though, matched with everything.  The bright colors are cheaper but my favorite is still the neutrals and I'm going to buy more.