here’s the trick we used to deter wich mask was most suited for us. We invited multiple firms with their open face mask on site and made test version on the same person with supervision of the firm application specialist (multiple test cases, several different persons with each mask on each person). after we placed the persons with their mask on and made a direct capture. Than we asked the persons to move as much as possible with align rt (OSMS) tracking their motions. The mask wich made the best impression got the deal. We are still quit happy with our masks.