The Shark XTSM200 Replacement Scrub Pockets have been constructed with a special scrubbing surface for tackling tougher stains. There are two sides to the pocket pads, a scrubbing surface & a thick microfibre surface for lifting & trapping dirt, leaving floors in sparkling condition. The patented pocket technology allows the fabrics to breath so the pads stay dry. The double-sided Shark XTSM200 Replacement Scrub Pockets are machine washable so you can use them over & over.