Ties that go behind the head keep a mask on much better than do ear loops. When I need a mask to stay on tightly for long periods, I wear these masks. They are also of heavy material that will help keep viruses out!
I will only wear Jamriang's mask because of the care with which they have been made and they are lovely and soft on your face too. I wash them in a 'delicates' bag in the washing machine.