The Optifog® lens has unique, hydrophilic top layers with inherent fog repellence properties. The anti-fog top layers placed on the Optifog lens are activated with the Optifog Activator Cloth. The Optifog Activator Cloth has the power to ACTIVATE and CLEAN the lens at the same time. Just use the Optifog Activator Cloth whenever you clean your lenses. Together they provide fog-free vision by spreading fog into a uniform, invisible layer of water on the lens surface.
Neither heat nor cold nor humid conditions will ever cause fog to form on Optifog® lenses!