|Shock Doctor Knee Sizing Chart|
|Measure knee circumference 2" below center of knee cap (patella)|
|S||12.25 - 13.25|
|M||13 - 14|
|L||13.75 - 14.75|
|XL||14.5 - 15.5|
|XXL||15.25 - 16.25|
I have this support mostly for my left leg as I have no ACL in it and use it when I'm doing activities with my kids or sports. It provides excellent support and is comfortable even though it does get pretty warm. The only complaint that I have is that can be kind of difficult to get off after using it but other than that I love it. My ortho doc recommended it after my last knee injury and we found out that I didn't have an ACL any more. Very durable and offers pretty good padding as well.