OptiSmart is a high-tech microfiber knit cloth composed of advanced ultra fine microscopic polyester / nylon fibers, 1/200 the diameter of a human hair. This weave enables it to scoop up and trap soils between its super sharp knife-like fibers. Safe for all delicate surfaces and lenses, OptiSmart safely and easily cleans smudges, dust, dirt, oils, and other contaminants with or without a liquid cleaner.