This cap is a little unusual, due to the thickness of its Sonic design.
It is a 'flatbill' style cap, where the brim is stiff, not curved at all. The main cap part is mottled gray, with a single classic Sonic face on the front. It looks like a smooth cloth/embroidery combo item, but it's somehow even thicker than usual...maybe raised on a fabric backing?
For added interest, the brim is blue, with full color running classic Sonic with a 'speed smear' of color trail behind him. The two elements combine to make the classic type hat seem fresh. This is a 2016 item, but where is it sold?