This chemically treated Fog-Free Mitt prevents Steaming Shower Mirror And Car Mirror from fogging or steaming. When stored properly, the mitt will keep your mirrors fog free for up to 50 uses! Each time lasts up to a week! Take your mitt in the shower for a clear mirror after your shower, or in the car for those foggy/rainy days. - Pack of 2 Unisex Adult Prevents mirror from fogging Lasts for over 50 uses Travel or domestic *Each application can last up to a week Set of two mittens.