Measure the circumference behind the knee and around patella (kneecap) while leg is at a slight bend. Measurements are in inches.

S – up 15″
M– 15-17″
L– 17-19″
XL– 19″ and up
If you find that you are in between sizes, determine the best fit for you by measuring up to 4 inches above your kneecap, and then follow these simple guidelines: