Idk....Maybe I have a big dome but I couldnt even get this thing on short of it smashing my brain and pulling my hair out. I probably could have but I didnt actually get it all the way on because it was just too difficult. These things should slip right on and off with no pain. This thing made me feel like I have a ginormous head which I dont think I do. Ive had many other clavas that fit me fine in the past.