Dependable: ZEISS eye masks are one-size and designed to fit any face with soft, comfortable ear loops. Safe: Enjoy dry eye relief without a microwave or electrical plug needed; simply open the package and place the mask on your eyes after removing makeup and contact lenses. Effective: ZEISS warm eye masks self-heat to a gentle temperature for at least 15 minutes to help refresh dry eyes. Relaxing: Give tired, puffy eyes much-needed care while traveling, for on-the-go soothing relief. Convenient: Individually wrapped and single-use for hygienic and convenient purposes, perfect to keep in your car, purse, or backpack.