Size Guide (based on circumference of knee): Small <33cm Medium 33cm - 39.5cm Large 39.5cm< Giving full lateral and medial coverage, the SL2 low profile volleyball knee pads give a superior fit without bulk. The fabric is vented at the back of the knee to assist in wicking away moisture. Shock–absorbing cushioning pads Low profile design that still maintains maximum coverage and protection Articulated padding zones with full lateral and medial coverage Dynamotion Fit for superior fit without bulk Vented at back of knee to assist in wicking moisture away Slightly curved upper and lower back seams results in less bulk behind the knee 7" sleeve length