• Revolutionary antiviral ≥ 99.9% protection mas • Excellent microfiltration BFE ≥ 95% and PFE ≥ 95 • Antimicrobial ≥ 99.9% technolog • Water repellency 100/10 • Proven to destroy ≥ 99.9% SARS-CoV- • With invisible nose wir • With tightness adjustment stopper