I ordered medium, but received small. I can't find this info on my orders to confirm if it's my fault or Amazons fault, but I'm pretty sure I ordered the media because I needed it. I bought these shirts from Walmart a few years ago and really liked them so I decided to find them on Amazon for my new job but this time in black. They're not as I originally remembered them, but they're still comfortable, soft, breathable, and stretchy. I hope they hold up just as well because I still have the ones