It adds a layer of additional protection to your mask. It takes a little adjusting to get the filter in the mask pouch, but once it is in it stays in place.
If you’re looking for excellent Filters in this hard to find shape used for most Sport Masks these are the ones.
Hard to put into mask.
Those plastic tighteners finished right behind my ears and pushed them forward -out far enough where it made me laugh at myself. Messed with settings but never was comfortable.Took them off and it was loosely hanging under my nose. I think I threw it in the glove box in case of emergency. At night lol. Wouldn’t buy another.