For better cleaning of smooth surface. Dust is collected and retained by static cling and the unique twisted yarn in the Synergy dust mop. The mops don’t have to be treated so they don’t add to the oil in wash water effluent that needs special treatment. The mops are made with tough polyester backing that lasts longer and doesn’t shrink. Synergy mops offer the look and performance of cotton mops with the advantages of synthetic yarn – the best combination of performance.