UnderCool Sizing Guide

Size Waist Length
Extra Small 24" - 28" 15"
Small 26" - 30" 16"
Medium 28" - 32" 17"
Large 32" - 38" 19"
Extra Large 40" - 45" 19"

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.)