One of the most comfortable masks on the market! 4 breathable layers, anti-bacterial, water repellent. 3 inner layers with antimicrobial and virus inactivating agent. Made using silver ion technology. Efficacy- Research conducted among academics, industry partners and government agencies, proves the silver ion technology to have anti-microbial efficacy and to inactivate some strains of viruses. The registered active agent in this mask is made using this technology and has been applied in the USA, Canada, EU.