Picked up a Lost and Found beanie from another member and, to my dismay, it doesn't quite fit right on my head. Before you become concerned, this is primarily due to the fact that mah dome is disproportionately large. Still, this thing is awesome and I had been eyeing it for a while before I came to realize that Lost and Found freesizing isn't the best for me. Either way, my loss is your gain. Diameter: 10"