ThumbPRO Sizing Guide
To determine size, measure using a string or ribbon around the thumb halfway between the first and second knuckles. If you play with batting gloves, be sure to wear them when making this measurement.
Large:
2 3/4" circumference (generally 200 lbs and above)
Medium:
2 1/2" circumference (generally 125-200 lbs)
Small:
2 1/4" circumference (generally for under 125 lbs)
Use this as a guide. If in between sizes, we generally recommend going with the smaller size for a secure, snug, performance fit.