I have a big head to begin with, and dreadlocks on top of it all. My head measures 25 inches with the dreads and I have NEVER been able to find a hat to cover my head from the sun. This hat has a huge brim and is wonderful for sun protection. I ordered the 2x and was scared it would not fit, but in fact, it fits perfectly. As a double bonus, it is very cute as well. I am so happy I found this site. I want to order so many hats now that I found a hat for my big head!!!