Have a family holiday with snorkeling planned?! These work well for those with an aversion to full face in water, not familiar with how to have a snorkel in mouth (e.g., they were used on a Cayman vacation with four year olds just starting swim lessons). Worn 1-2 trips. Have been cleaned but may have some sand stuck in creases. Back straps are adjustable to head size. I wear a 7 ¼ hat size, medium ski and bike helmets, and it easily fits me https://www.divein.com/diving/tribord-easybreath-full-face-snorkel-mask/ I have three, all small/medium size, differing colors.