ProFlex® Open Patella Knee Sleeve, Medium, 1 Each Hot and or Cold Therapy Wraps Right Extension * Padded cushion Style:Right Ear Right Extension * Padded cushion is specially designed for the left and right * Black leatherette zippered cover * Leg extensions are approximately 1 2 of the seat width x 9 long * Overall length with Leg Extension is 25 * Overall thickness is 1 1 2 and have a 5 8 plywood base 18 Wide x 16 Deep x 1 It provides an efficient measure the circumference around the center of your knee while the knee is extended: 14 – 15 inches means a medium knee sleeve is the one for you 3 millimeter thick neoprene is perforated and spandex is in mesh form so knee sleeve is breathable