The Platinum Magnetic Knee Support provides maximum knee pain relief, fully adjustable compression, and superior support for knee instability. Designed to help more severe discomfort from arthritis, knee sprains, post-surgical recovery, torn cartilage, and other painful injuries that cause weakness in the knee joint. The Platinum Magnetic Knee Support opens flat – making it easy to put on and adjust from a sitting or standing position. Two tension straps provide fully adjustable compression above and below the knee, helping to reduce muscle strain and pain while you’re bending or walking. Spiral spring stays on both sides of the knee provide added stability and support, without restricting your movement. You’ll appreciate the additional support when walking with a weak or injured knee. Small / Medium 12½” – 15″ Large 15¼”- 17″ X-Large 17¼” – 21″ * Measure the circumference of your leg at the kneecap. Use this measurement to select the proper size from the chart. If it is between two sizes, we recommend you order the smaller size.