NEW COLORS! Various Head Tie masks have been added to this low price. These face masks are double layered 180 thread count or higher cotton masks with ear ties. According to the CDC can prevent approximately 50% of small particles like viruses vs. no mask at all. To learn more about materials and how they do against small particles visit Smart Air Filters's Blog that answers your questions. Please also review the CDC's guidelines on cloth masks. Once this style of mask is sold out, they will no longer be produced.