This hat is classic style, with a collage of blue-outline-only classic Sonic artwork scattered all over it. The front has what looks like a flat rubber /plastic "rolling Sonic" stock art disk. It does not look embroidered. However, the hat itself has something unusual about it. The sticker there is marked "Youth Size", which means its generally smaller than normal hats. But how much smaller are kids' heads? And isn't this cap usually the type that has an adjustment snap in the back to change the size of it anyway?
The hat isn't common, probably from around the start of the 'classic style' repopularization. It's likely not common because who wants to spend 18.00 for a tiny cap that won't fit for very long & then you can't do anything about it?