Titleist has released leather hats and hats with leather straps here from time to time, keep checking back.. And they sell out fast!

It is a split panel hat, closest current model sold publicly is the "Diego" hat. It has the plastic snapback adjustment instead of the leather strap but has the same seam that runs across the top front. There are some tour players that have some special styles, either legacy hats no longer on the market or a particular brand that gets Titleist logos added so it is not always possible to match up to every Titleist player you might see on tour. Titleist has to release the styles and quantities that they feel will meet market demand. Sometimes it is hit or miss. Hope this helps.

Oh, and he sometimes wears a Tour Rope Flat Bill too. I think he had a version of the rope hat on Sunday when he won.