Yes! That is always possible. When I am wearing my masks, I periodically check to make sure my hearing
aids have not 'moved' from where they are sitting on my ears. With the addition of my glasses, especially when switching from prescription sunglasses to regular glasses, it is even more critical. I recently volunteered with an Etsy mask maker to "trial" her new design for an elastic behind the head style. Ties were not a good idea for me having had multiple hand and finger surgeries years ago that permanently altered their dexterity and flexibility. For me, this style was even worse as the fabric not only squashed my ears, making it difficult to position my HAs', it also covered them. The elastic was extremely uncomfortable and it did not fit securely against the back of my head no matter how I tried to position it.