Great henley -- super soft and comfortable.  It is pre-owned and has shrunk a bit in the wash so I am calling it a small even though it is marked medium.  Please be sure to check your measurements:

Armpit to armpit: 19
Shoulder to shoulder across the back: 15
Length: 23
Overarm from shoulder seam to cuff: 24
Underarm from armpit seam to cuff: 18

Thanks for looking and please be sure to check out my other listings!