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how do you work out sizing for a 9 yr old boy? he is pretty average size for his age.
There is a size chart on the site that you can use it to work out the right size for the boy. You can measure basically 2 different spots where the strap goes on Knee, Elbow and Wrist. Let us know if you are having any difficulty comparing the actual body size to the size chart, we can help out with it if you could send us the actual measurement.