This covers your nose and mouth and is secured with elastic bands that wrap around the ears. There are 2 layers of fabric for added filtration. Made with a soft polyester fabric that is easy to breathe through. They are washable and reusable. Approximate Sizing S - 4 inches tall | 7 wide M - 4.5 inches tall | 7.5 wide L - 5 inches tall | 8 wide XL - 5.5 inches tall | 8.5 wide