Silicone Mask Insert - Dont talk or move your face in any way ....
The 'idea' of such a product is fantastic [I have asthma and struggle to breathe without a mask on].  The reality of the product is it does not grip the mask, and when you move your mouth - facial muscles, it is o longer functioning and moves.  I work in face to face customer service, so I have to speak.  Speaking moves the  device, which moves the  mask.  Like I said, the Idea is much better than the reality - and the reality here is a personal product is not refundable - so caveat emptor  people, caveat emptor.
Rating: 2 stars