Pad sizing is based on one of two measurements (or sometimes both). The two measurements are floor to knee (FTK) and ankle to knee (ATK). Both measurements should be measured with a slight bend in the knee while sitting or standing. FTK measurements are done with a bare foot completely flat on the floor, and is measured from the floor to the centre of the kneecap. ATK measurements are best taken on the outside of the leg, from the centre of the ankle bone to the centre of the kneecap.

The plus sizing (+1″, +1.5″, +2″, etc.) that can be found behind some pad sizes does not affect the actual fit of the pad, and is more of a preference for coverage and style. The plus is referring to an extra inch added to the thigh rise, which is the part of the pad that extends above the knee block. Some goalies like having a large thigh rise (+2″) for more coverage in the butterfly, where some goalies prefer little to no thigh rise as it may cause the pads to catch on themselves while going into the butterfly. Examples of sizing with thigh rise additions include 28+1″, 36+2″.