Measure 6 ” above your waist as shown in photo. Norm is at 46″, so he takes a medium.
Small: 37″ to 43″
Medium: 43″ to 50″
Large” 50″ to 56″
Xtra Large: 56″ to 62″
If anything does not fit, please let me know and we can exchange. This formula has worked well so far!