Nose pads for face mask, reduce air leakage & add comfort.
Air Filtering Mask are only good as his/her wearer. A nose pad greatly reduce air leakage and prevent fog from building on your glasses. It also reduce strain and skin irritation on your nose. If you bought a Metamasks inside each mask you should have found a nose pad sticker. These soft pads tend to flatten with usage and become less effective.
Here is how to fit your Metamasks: