Dense 3 - 5 micrometer quality fiber removes more dust, dirt and microbes than conventional cleaning products. It has an advanced hook-and-loop backing... holds-up under harsh laundering conditions and attaches pads more securely. Scratch-resistant scrubber flap to remove stubborn spots or heel marks. Double finished edges retain mop shape with use over time. Patent Pending Zig-Zag design packs 17% more split microfiber into each mop. It is proven to clean floors 45% better than string mops, 25% better than conventional microfiber. Superior construction and premium grade materials maximize durability and product life. Durable through 500 launderings, 200 with bleach.