Set of 2. One for you and one for a friend in need! Great for running, biking and travel. Use in schools, colleges, and offices for staff and visitors. One size fits most adults. Triple layer protection. Recycled polyester, melt blown fabric, 100% cotton. Purpose: to protect you from germs, smoke, pollutants, droplets, bacteria, dust, toxins. Features washable reusable 95% bacterial protection. Dust resistant, splash resistant. This mask is not a replacement for surgical-grade personal protection and has not been reviewed, cleared or approved by FDA for the said purpose.