Neither comfortable nor useful -- needs work
This is a good idea in theory, but poorly executed.<br /><br />There's not much in the way of Pros, and many Cons.<br /><br />Pros:<br />  - 1. Washable and reusable<br /><br />  - 1. As others have mentioned, this opens up the sides of the mask so so much that it effectively means that you're getting unfiltered air coming in.<br />  - 2. These don't fit an adult face unless you have a small chin. To get the mask to cover the nose, the bottom edge of the mask will press into your skin above your chin and below your bottom lip. It's not a super sharp plastic edge, but it's enough to make a mark when you wear it for a while.<br />  - 3. There's nothing to attach this to the mask, so when you remove the mask, this will fall off onto the floor or the ground unless you remember to catch it as it falls.<br />  - 4. It doesn't work with regards to preventing your exhalation from fogging up your glasses -- it does reduce it a tiny bit, but not nearly enough to be useful.<br /><br />I really wish this worked as described, although it might work for children. Hard-pass on this particular mask insert. We'll see how some of the others work.
Rating: 1 stars