Bodyguard Has Designed N95 Anti-Pollution Face Mask To Provide Reliable Respiratory Protection. It Employs Six Layers Of Quality Filters To Effectively Protect You From Dust, Odour, Pollen, Toxins And Pm2.5 Particles. Why Use Bodyguard Anti-Pollution Face Mask? Filters Pm2.5 Particles Easy To Wear Washable/ Reusable N95 Effective Filtration Comfortable Fit Indications For Use: 1. Store Between -10ºc To +35ºc 2. Replace If Damaged Or Soiled 3. Stop Use If You Have A Hypersensitive Reaction 4. Washable (Once) After 120 Hours Of Usage Layer-Wise Specification Of The Filter 1St Layer - Cotton Cloth To Provide Protection From Heavy Dust Particles 2Nd Layer - Activated Carbon To Protect From Smog, Vocs And Hazardous Gases 3Rd & 4Th Layers - Grade Melt-Blown To Filter Pm 2.5 Pollution Particulates 5Th Layer - Nonwoven Fabric To Absorb Unwanted Moisture & Provide Fresh Air 6Th Layer - Soft Cotton Cloth Layer For A Comfortable Fit.