They say that fit is everything, as most masks do not provide a good seal to the face on the sides. The device also prevents glasses fog.
Fix the Mask CEO Katherine Paseman joined ABC7 News Anchor Kristen Sze on Getting Answers to share how their rubber brace works. There is even a template on their website if you want to make your own.
Paseman was joined by University of Maryland School of Public Health Professor, Dr. Don Milton, who also explained why safe masking requires both good filtration and a tight fit, which is missing in many KN95 masks.