The Best Nuisance Dust Mask! Made from woven polyester with heavy 3/4" elastic straps with hook and loop closure on the bottom and plastic quick release buckle on the top, this mask forms to all face shapes and even works with beards. Easy to breathe through and it's hand washable. With proper care the Dust Bee Gone Mask can last for years. Medium (women/small men, neck size 14-15). Micron rating is 3 microns.