100% cotton face mask featuring either a brushed twill or plain weave oxford fabric. Per CDC recommendations, these masks are made with two layers of finely woven cotton. Twill straps make for ease of adjustability and comfort of wear (because if its not comfortable, you won't wear it). Please be sure to wash hot before first use, and after each use. Please note - these are for personal use and are not certified for any other use. For bulk orders please reach us at firstname.lastname@example.org for quantities and pricing. Thank you and be well.