This face mask is 100% cotton, reusable with a solid back and has elastic for the ears. It is a double layer pocket mask which comes with one filter. The filters are a 5 layer carbon filter & last about a week. Extra filters may be purchased here on my website. https://www.hipperbib.com/product-page/mask-filters. Pick between average or large. The average is 12.5” from elastic to elastic and fits most average size ladies and the large is 14” and fits men and some women with larger faces. The masks are not returnable so please make sure to measure. **see filter info ** please note this is not as effective as an N95 mask.