Cotton material - breathable, washable and reusable, Care instructions: Remove filter before washing. Filter cannot be washed and should be replaced every 1-2 wears. Wash mask and store it away from other fabrics to prevent cross contamination. Wash in cold water by hand or in a washing machine on a gentle cycle. Line dry only. Do not tumble dry. Slight shrinkage may occur after washing. Don't wear mask when damp.