Tightly woven poly/nylon microfibers make these extremely durable cleaning cloths. The microfibers effectively cut through dirt and lift oil and moisture from the lens surface. It differs from most cloths which move the dirt and oils around instead of removing them. Orange, anti-static micro-fiber cloth has stripes of effective conductive fibers knit every 1/8" that dissipate or drain off static charges. Hundreds of thousands of small pockets in the cloth aggressively capture the dust and dirt. The thick, soft cloths are completely non-abrasive.