1st scarf with air pollution, allergy, cold & flu protection built right in! The Bioscarf incorporates an air filter right into the scarves design. In tests the Bioscarf filtered out an average of 99.75% of all airborne particulates. That means it can help protect you and your family from pneumonia, strep, influenza, tuberculosis, pm2.5, pet dander, pollen, smoke and many other airborne contaminants that not only cause allergies but can also be harmful to your health.