One size fits most, stretchy ear loops made of high quality fabric 2 layer modal blend, comes with a filter pocket, hygroscopic and breathable wearing this protects you from dust, small particles, small pollen 
Anti dust, anti-odor, washable, and reusable 
Wind proof 
Protects from droplets, smog, dust, ash, and can also protect your privacy 
Hand wash gently in cold water with mild soap-air dry 
Can also handle machine washing and drying 
*******this is not antiviral** but will remind you not to touch your mouth, nose, shields someone from sneezing on you