Our fabric masks are produced in Ontario California using industrial Gerber cutting machines and industrial sewing machines. These masks are ideal for healthcare workers to be worn over the N95 mask to increase its longevity, or for general public use. We use pre-shrunk outdoor fabric, which is WATER REPELLANT and ANTI-MICROBIAL and the outer layer and a soft industrial-grade polypropolene on the inner layer. The Fabric is very breathable. Our Masks can withstand washing in the highest of temperatures.