Details For each 3 pack purchased, one mask will be donated to Chosen 300 to benefit Philadelphia residents experiencing homelessness. Crafted to CDC specifications for cloth face coverings to help slow the spread of COVID-19. These are not medical-grade face masks, and are intended for use by the general public when not at home. Filter slot between layers that fits our Activated Carbon Filters Made from deadstock fabric: a blend of Hemp, Organic Cotton, Recycled Polyester, and TENCEL™ (percentages vary per mask) Fabric weight between 3.8oz-5oz per mask Made responsibly at our primary apparel factory in China One size fits most - 24.4cm from left ear to right ear (fabric only), and 15.5cm from top to bottom in the center. Masks are final sale and cannot be returned or exchanged.