I think I'v come across them on another forum, something fits under your chin and you open your mouth to raise the mask,and close it again to drop it, not for me i'm afraid !!!
P.S. What area of teesside are you brightspark P.M me if you don't mind disclosing this info.
Best regards Gordon.
I wonder how many times a day you'd bite your tongue using one of those ? Multi tasking is not that hard for men, picking their nose and driving seems to be the best example.