What make are those, sound interesting? I'm after something a bit better than the disposable surgical type I use now.
They are 'work' branded so won't be available for public purchase. They are face coverings, not masks, with the company logo on them.
Some washable coverings are suitable for putting a filter inside, such as an extra layer or two of cloth or even kitchen towel. Depends on who made them and were you can get them.