Lp Support Knee Support - Open Patella. Features: - Oval Pad Gives Extra Padded Protection To Knee Joint. - Reinforced Stabilizer Around Kneecap Prevents Patellar Displacement. - Helpful For Postoperative Knee Problems, Strains, Arthritis And Protection Against Abrasions. - Materials: 75% Closed Cell Neoprene Foam, 25% Stretch Nylon. - Washing Instruction: Hand Wash In Cold Water With Mild Soap. Rinse Thoroughly. Air Dry At Room Temperature. Do Not Machine Wash Or Dry. - Should A Rash Or Irritation Occur, Discontinue Use And Consult Your Physician. Size: Measure The Circumference Of The Knee At The Patella With Knee Fully Extended - Small - 33 - 35.6 Cm - Medium - 35.6 - 38.1 Cm - Large - 38.1 - 43.2 Cm - Extra Large - 43.2 - 50.8 Cm