1.Environment-friendly mask filter with virus kill sterilization antibacterial function 2.Use of Polypropylene fabric (contains hydrogel) 3.Ergonomic three-dimensional design for excellent wearing and easy breathing 4.Complete skin irritation test 5.Functional nose support prevents dripping when worn and prevents fogging when wearing glasses. 6.4-layed structure electrostatic filter to protect the respiratory system. 7.Excellent sterilization effect by embedding natural energy salt clean water and coral (chitosan component) calcined powder between the fabrics. 8. FDA Approved. If You Have Any Inquiries, questions Or Spontaneous Feedback, Feel Free To Contact Me Through E-mail Or Whatsapp.