Wow. When I received this product I was amazed.  About me.  I love field jacket liners and wish it wouldnt look weird wearing one everyday.  I served in 10th Mountain Division and these are pretty much everyday wear when out in the field.  I remember when i was in the service we would complain because our field jacket liners didn't haev buttons but when I received this product I was amazed to see 3 buttons on it.  I ordered the Large since I am 6'0 215pnds and it is a great fit.  Hope this review helps.