I'm kind of an average built but every time I wear regular size shirts, it makes me look like a fat person in the mailroom who doesn't know how to buy shirts.  This one is fitted nicely where the chest nice and snug but the belly doesn't stick out.  I don't know how they did it.  I also like the material because unlike 100% cotton, it doesn't wrinkle too much and makes ironing easy.  Yes, I iron my own shirts most of the time.  $1.69 is a $1.69.