Advanced Filtration Tecnology: The filter element of this mask has 5 layers of protection, bringing you a safe breathing experience. Warm Tips: Masks Replacement Filters, disposable supplies cannot be washed. Recommend replacement of 1~2 times a week. Safe Breathing :With 5 layers of protection,it can bring you a safe breathing experience. Unique Ventilation Design: Excellent permeability easily be doubled up for extra protection. Suitable for prevent fog, haze, ehicle exhaust, passive smoking,etc. Reusable Material: Made of active carbon filter,it cannot be cleaned. So,it is recommended to replace it once a week. mask for air pollution Ingredients: