Ultra microfiber pads have 5 to 10 times more fibers than other microfiber pads so they are more absorbent. The ultra-microbers are so thin that more dirt and dust gets trapped between the fibers which makes cleaning simpler and less time consuming for you. The multiple layers of super absorbent material beneath the microfiber surface extract the moisture from the microfiber to dry floors quickly. Can be machine washed up to 300 times. For use with HAAN steam cleaning floor sanitizer models FS 20, FS 20+, FS 30, and FS 50.