I believe Brooks at Challenger still has a supply of these all-cotton, "back-to-back" pads. These are in a 18" or 19" diameter size, I believe. I prefer pads that are closer in size to the Challenger pad driver. For one thing they are easier to squeeze out by hand than larger pads with more bulk to them. I can go to Tuway and buy their 2-sided terrycloth "Bullseye" pads in various sizes. They are thinner than the traditional cotton 2-sided pads, but they otherwise work fine for me.
