The Rubbermaid Commercial HYGEN Microfiber Damp Room Mop is constructed of premium split nylon\/polyester blend microfiber that provides optimal damp mopping performance. HYGEN floor microfiber mops clean 45% better than string mops and 25% better than conventional microfiber mops with a zig-zag design that packs 17% more split microfiber into each mop. Hook-and-loop microfiber mop pads attach securely and can be easily replaced when necessary. These floor mops withstand heavy use with double-finished edges that retain their floor mop shape and can be laundered more than 500 times, 200 with bleach. These mop heads are color-coded blue for general purpose cleaning in low-risk areas.