If you find that you are in between sizes, determine the best fit for you by measuring 4 inches above your kneecap, and then follow the guidelines below:
Small vs. Medium
If you measure exactly at 15 inches and not sure which size to select. Take a second circumference measurement at four inches above the top of your patella (kneecap), and if the measurement is less than 16 inches, select the smaller of the two sizes.
Medium vs. Large
If you measure exactly at 17 inches and not sure which size to select. Take a second circumference measurement at four inches above the top of your patella (kneecap), and if the measurement is less than 19 inches, select the smaller of the two sizes.
Large vs. X-large
If you measure exactly at 19 inches and not sure which size to select. Take a second circumference measurement at four inches above the top of your patella (kneecap), and if the measurement is less than 22 inches, select the smaller of the two sizes.
Size straddling is specific to the knee (not all products).