UnderCool Sizing Guide

Size Waist Circumference Height
Extra Small Up to 28" Up to 5'4"
Small Up to 32" Up to 5'7"
Medium Up to 38" Up to 6'
Large Up to 44" Up to 6'5"
Extra Large Up to 52" Up to 6'5"

Quick Reference Sizing Guide:

ThermApparel recommends ordering a size smaller than your usual T-shirt size. (If you wear a large T-shirt, a medium UnderCool will fit best.)