Yes, most Celtic Croft face masks are CDC compliant. The cotton mix fabrics have an estimated 74.60% effectiveness of filtering against bacteria and 70.24% of RNA viruses. Maks made from two layers of 100% cotton has an estimated 70.66% filtration efficiency against bacteria. A single layer has roughly 50.85% against RNA viruses. The CDC recommends wearing a facemask over a gaiter, bandana, or handkerchief. Businesses have full discretion to refuse you service for whatever reason.