Measure under arms around the fullest part of the chest. Be sure to keep tape level across back and comfortably loose.
Measure around natural waist with a loose tape.
A WORD TO THE WISE
Our shirt bodies are 100% cotton, sweatshop free, made in the U.S. of A. They are slim cut and definitely shrink some after a machine drying. If you haven't flown with us before, we recommend taking a step up in size if you think you might be on the borderline. There is no shame in being extra extra large, my dude.