Answer
May 21, 2025 - 11:42 AM
Hello.  When just laying flat on a table, Small measures 42 inches circumference at the armpits, Medium is 44 inches a Large measures 47 inches.  Keep that in mind for sizing because you'll be layering under the windbreaker.  But if you have any questions please let us know: 1-800-783-8326 or orders@aerotechdesigns.com.  
Thanks!
