G-Form PRO-X Knee Pads [Medium] Black/Yellow Size: Medium Color: Black/Black w/Yellow RPT Impact Protection: Articulated Design, Flexible, Lightweight, Low-Profile - Machine Washable - Stays In Place - Comfortable G-Form PRO-X Knee Pads fully articulated design offers maximum protection centering on and surrounding your joint, with virtually no bulk. With G-Form, you never have to worry about compromising movement, in fact you will not even realize you are wearing them. M Size is for: THIGH (measure 6" above kneecap) 16.5-17.5in / 42-44.5cm -- CALF (measure around largest point) 14-15in / 35.5-38cm