
I bought this to sing and the mask didn't stick to my face when I breathed in. Unfortunately these mask inserts appear to be sized for a child and I have a medium sized face and head. I can imagine how I would like them if they were big enough. There's some plastic that gets uncomfortable, but it's flexible enough to be placed in two layers of a cloth mask (where the filter fits). For singing or public speaking I would use two small stitches to attach the insert to the inner layer of the mask. Otherwise, this layer is still tight against the face when you take a deep breath. FYI, I have requested a refund and will update this review with the results once I hear from the company. This project is not covered by the Revain Prime Refund Policy as it is from an independent seller.

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