Check the listing for details. DynaTrack Plus Patella Stabilizer. Condition: New. Listed at 65.00 USD. FEATURES AND BENEFITS Sizing: fits left or right knee, measure knee circumference at mid patella for sizing chart US manufacturing: high quality control standards Easily adjusted to desired amount of pressure: the tension on the straps can be changed by adjusting the straps Open Popliteal: a large popliteal opening permits a high degree of flexion with no discomfort Anterior Closure: the wraparound design allows for ease of application and an optimum fit COMMON EXAMPLES OF USE Lateral or medial patellar instability Knee injuries Patella tracking issues Patella tendonitis Patella femoral dysfunction Size Knee Circumference (measure at mid patella) XSmall 10" - 12" Small 12" - 14" Medium 14" - 16" Large 16" - 18" XLarge 18" - 20" XXLarge 20" - 22" New in box from medical clinic that has closed.