If mops last one-fifth of their potential lifecycle, you can use less expensive materials to construct the mop. The traditional microfiber flat mop uses microfiber fill layers to provide a semi-rigid structure. We replaced the fill layers with foam to save money. The outer layers use the same split 80/20 Polyester/Polyamide scrubbing surface, which is just as effective. However, the cost to replace the mop is reduced by 1/3.