This hat fit perfectly. Size 10 quadruple X? huh? that sounds big. I managed to keep it on the whole time (you canter with your head pointing down so the wind pushes the hat on vs sending it off like a sail). During our last gallop - which is what it turned out to be - I had my hands full keeping Buster from grabbing the bit with his teeth and tearing off to race the other two. He really wanted to win and he was quite fast. But being the good, compliant lady I really tried not to let him let completely loose. Nevertheless...lost the hat! John hopped off and got it. Thanks again!