The microfiber plush cloth is safe to use on windows, smooth and coarse surfaces as well as automotive finishes. It is constructed from woven polyester / polyamide blend microfiber. The open spaces in the fibers created by the splitting process are what give the towels its ability to hold dust and dirt as well as its ability to absorb liquid. The edges of the towels are sewn with over lock stitching which greatly increases the life of the towel.