Our Microfiber closed-loop material is made using an 80/20 blend woven microfiber material. This pad is made specifically for sanitation cleaning. There is no sponge in this pad, and it is replaced with two layers of highly absorbent microfiber woven fabric eliminating the bacteria breeding associated with sponges. The closed-loop microfiber cleaning face will increase pick-up capacity, allowing you to clean larger areas with one pad while providing a slower release of liquid and a deeper clean than a standard low-profile pad.