Large: 19.7" -22.4" circumference Extra Large: 22.8" -33.5" circumference *measurements taken 4" above mid patella Product Number MD01105L ---- Long Knee Immobilizer, Large (Regular) MD1105XL ---- Long Knee Immobilizer, Extra Large Accessory Number GP00001-R ---- Long Rectangle Gel Pack GP00001-K ---- Large Knee Gel Pack Please enable JavaScript in your browser to complete this form.Name *FirstLastPhone Number *Email *Organization Name *Which product would you like to learn more about? *Cold Compression WrapsWalking BootsThermoplastic Custom SplintMessageSEND NOW