It runs a bit big...better if you are a man or have a larger head. My husband and I are going to be the coneheads for Halloween and I bought this one and another different one so that our cones would be different sizes, like the real coneheads. This one will not fit my small head, so it will be my husbands. The problem is, it matches my skin tone better and the other cone that fits my head matches my husbands darker skin...oh well, some make-up will remedy that.  Also, there is a powder all over the rubber in this mask. Best to wipe it down with a damp cloth or rinse it out because I got some of the powder on my fingers and rubbed my eye and it burned. If you wash this mask off first, have medium-light skin tone, and you have a big head, it'll work fine for you. I also bought some gum glue to hold it on around the edges, but I think it might not be needed after all.