It's not easy buying a mask online. It needs to fit and it's really hard to figure that out without trying it on. I have a big head (7 7/8) and glasses and the staff at United went out of their way to all try on the masks and even had a customer similar to me try it on. The mask is amazing, but the help from the staff at United was far better and gave me the confidence to know this would work for me despite not trying it on. If you have a big head and glasses and can't find a mask that fits you, get an All Star FM4k, there's a ton of room, it's super light, very comfortable and looks awesome with the sun visor!