I volunteer once a week at my local hospital as part of the Chaplaincy team. The nurses and other members of staff who have to wear masks all day find they chaff behind the ears.
So with other members of the team we knit or crochet mask straps which fit round the back of the head and then the mask hooks onto buttons on either side of the strap. Judging by the number I knit each week, they are very popular.