This Rubbermaid Hygen Microfiber Damp Room Mop features premium split nylon/polyester blend microfiber for optimal damp mopping performance. Dense 35 micrometer quality fiber removes more dust, dirt and microbes than conventional cleaning products. Advanced hook-and-loop backing holds up under harsh laundering conditions and attaches pads securely. Double-finished edges retain mop shape with use over time. Patent Pending Zig-Zag design packs up to 17% more split microfiber into each mop than a typical mop. Proven to clean floors up 45% better than string mops, up to 25% better than conventional microfiber. Superior construction and premium grade materials maximize durability and product life. Durable through 500 launderings, 200 with bleach.