Rehband's 7mm Rx Knee Sleeve is designed for an extra level of support for heavier lifts or focused rehabilitation training. These heavy-duty SBR/Neoprene sleeves deliver maximum joint compression to promote better blood flow and reduce the direct strain on the knees during squats, Oly lifts, and Strongman workouts. Whether you're battling back from nagging knee injuries or looking to prevent one, a thicker knee sleeve can provide some much needed peace of mind. Keep the knee slightly bent (about 30 degrees) and measure the circumference (cm) around the leg, 10 cm below the patella Extra Small 31cm - 33cm Small 33cm - 35cm Medium 35cm - 37cm Large 37cm - 39cm Extra Large 39cm - 41cm