Reebok utilizes a "Floor to Knee" fit guide to determine the proper leg pad size to meet your needs.  To determine your "Floor to Knee" measurement, measure the distance from the floor (in bare feet) to the middle of the knee cap, straight up, knees slightly bent.  Find this measurement in the chart below, then look at the number above it to find your pad size.

If fitted properly, the goalie's knee should rest in the center of the knee cradle with the pad securely attached to the goal skate and properly strapped on the goaltender's leg. Generally, this will ensure that the pad breaks (bends) at the knee/shin and ankle as designed for optimal performance.