Featuresr skin friendly material microfiber non woven fabric and tper lightweight thin design wear no pressure and breathe more easilyr pm03 protection uses disposable air filter cartridges which has an effective particle capture efficiency of up to 98 percentr pm25 pm25 filtration efficiency as high as 9997r double defense structure cover with tough and lightweight imported ultra fiber material gentle fit facial contoursr 360 adaptable seal ring provides double layer protection