100 pack of single use anti-fog lens wipes to help prevent spectacle lenses from fogging during mask wear. Also an effective lens treatment for skiers, snowboarders, hockey players, ATV-ing and other sporting activities where protective goggles are recommended. Each application of anti-fog treatment lasts approximately 3-5 days. Please be aware that cleaning lenses with other lens cleaning products may strip the anti-fog treatment and therefore need re-application.