50 pack face masks are made of disposable material, moisture-proof, soft and comfortable. It comes with 3 protection layer and adjustable nose strip and round elastic ear loop to give basic protection to the user. Comfortable and breathable material allows you to use it the whole day. This mask should be replaced in time, and the long term used is not recommended, it is suggested to stop using it if there is any unfitness or adverse reactions in the process of wearing. This mask is not washable, please ensure that it is used within the validity period. You can store in a dry, ventilated place and stay away from fire and flammable materials.