Thermoskin Patella Tracking Stabilizer Large 14.5 15.75 Dressing Aids Pantyhose * Antracite * 20 30 Instrument Accessories Pantyhose * Antracite * 20 30 mmHg * X Large * Ankle Circimference 11 1 2 13 Thigh Circumference 23 5 8 32 * Hip Circumference 40 65 * Beautifully sheer hosiery Durable long lasting * Sandalfoot styling * Gradient compression for relief and prevention of venous disease * Therapeutically effective sheer lightweight and fashionable * The needle bearings that encompass the pedals and flywheel axle industrial grade Hutchinson Poly V belt and our three piece crank work synergistically to create the perfect formula for durability and performance Large * Has a fully adjustable internal buttress which ensures correct positioning and control of patella movement * Allows vertical tracking of the patella during vertical flexion extension * Assists in the treatment of patella problems including instability pain and subluxation (looseness)