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.These are not substitutes for surgical or procedural masks and are not FDA cleared.Made with a soft polyester fabric that is easy to breathe through. They are washable and reusable.Approximate SizingS - 4 inches tall | 7 wideM - 4.5 inches tall | 7.5 wideL - 5 inches tall | 8 wideXL - 5.5 inches tall | 8.5 wide