Blue Jay Slip On Knee Support Open Patella w Stabilizers Med Jobst Relief 30 40 Waist Hi Accepted by leading authorities as Jobst Relief 20 30 Knee Hi Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness and red green blindness each in two forms complete and incomplete * Includes four special plates for tests to determine the kind and degree of defect in color vision * Makes use of the peculiarity that in red green blindness blue and yellow appear remarkably bright compared with red and green * Color plates encased in specially designed album type books for ease of handling * Detailed instructions included Thigh Hi (Lace Silicone Strap) * Natural * 15 20 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 * HCPC Code: A4467 * Color: black * Designed to provide excellent support to stiff weak or injured knees * Knitted elastic provides moderate compression * Open patella provides additional support * Medial and lateral stays help stabilize the knee * Size: medium (14 5 17 ) * To size measure around the kneecap