Pads wear out - around 20 applications, or 10 to 20 hours, per pair. The three pack is the simple way to keep spares in the drawer rather than discovering you've run out mid-session.

Two pairs of Medium cover most areas of the body, and the pair of Large suits the lower back, knees and bigger muscle groups. All three carry the internal silver grid, which spreads the sensation more evenly across the gel surface than the EconoPads do.

Buying them together comes in for less than buying each pair on its own.