Mask up in style with colorful original one-of-a-kind masks. Masks comes with a 2-pack of carbon filter inserts and a pocket opening for the replaceable PM2.5 carbon filter. Small masks are 6.25 X 4 inches; Large masks are 7.25 X 5.1 inches. Outside layer is made out of 100% polyester water-resistant fabric, the inner layer is made from 100% water-absorbent cotton. The elastic loops are made of polyester and spandex and the o-rings are made out of silicone.