Okay, now we have even more of a reason to wish it were winter:
Yes, that's an Optimus Prime hat, and yes, you can have one.
This is the work of Etsy seller BeeBeeKins, who also makes hats based on Boba Fett, Ewoks, Thundercats, Sesame Street and more. If you order now, you'll have your awesome handmade geek hat ready to go before the first leaf changes color.
Oh, in case you think your face would get too hot, the "mouthplate" part is removable:
This hat is awesome!