Reaction Knee Support X-Small / Small Pull-On / Hook and Loop Strap Closure 13 to 47 cm Circumference - EachAbout Reaction Web Knee Sleeve, Extra Small Small (1 Unit) Progressive pain relief: The elastomeric web design helps to reduce pain by dispersing energy across the knee Elastomeric web: Acts to dynamically stabilize the patella on all sides, bringing the patella into proper tracking position to reduce pain for those with general patellofemoral instabilities Sustained comfort: The open framework of the elastomeric web, in combination with the mesh