Lightweight and breathable, this top-quality filtering material is perfect for face masks.Non-woven spun-bond polypropylene1.25 ounce per square yard (on par with most surgical masks)20 inches wideWashing: Machine Wash/Tumble DryWe recommend using this filter material in conjunction with tightly-woven quilting cottons for a stylish design and good quality filtration.This material has a melting point of approximately 320*. Do NOT use iron directly on the mask filter material. If you must iron your project, be sure to use a low heat setting and a pressing sheet or other heat barrier.