With so many other types of "Sonic Face Cap"...
You could guess that a Boom style version of the face cap couldn't be too far behind. As is the usual, it's a blue cap with large Sonic face on the front. It's all embroidery for the design, making it both colorful & sturdy. It has no indication of spikes, it's just a face without outline & his brown bandana extending across all of the caps' bill/brim.
The interesting thing of the cap, is that Sonic is quite cheery & playful looking in the art. This gives the cap a fun, cartoony appeal that many other caps lack. It seems like a bright & friendly type design for the hat. Where can you find it?