The LensPro FogKlear Anti-Fog Cloth is a valuable cleaning cloth to keep around for your photo and sport optics. The cloth is impregnated with an anti-fog compound that inhibits fog from disturbing your views. The cloth works by leaving a thin film of this compound on your optic, lens or other surface. This cloth can remove surface particles and fingerprints which can spoil your view. The double-seal storage bag design offers additional protection.