98% cotton, 2% spandex moldable wire at topline pocket for filter slips on with elasticized loops upper edge: 8.5" sides: 3.0" lower edge: 7.0" loop length: 3.5" not intended for medical or surgical use. wash with natural detergent before first use. mask can be re-used. for longevity, do not over-soak the mask and avoid washing in water above 30 degrees fahrenheit. hand wash cold, wash separately, do not bleach, line dry, do not iron, do not dry clean.