This cool Sonic cap is available at Spencers Gifts in 2011. It has embroidered classic Sonic on the front, with some screen-tone dots 'rays' for the background. But look under the bill/brim of the cap...there's an extra classic Sonic the Hedgehog logo! This added detail makes this cap stand out from the crowd. Sure it's slightly hidden, (while being worn) but it's a great added touch. This should be about 19.99.
This is a "Flatbill" cap. That just means the brim part there is very flat/stiff rather than being slightly curved like most other hats of this style/shape. The big circle/dot you see there is a foil sticker announcing this fact. The hat is mostly white, and the pattern is made up of scattered/over-lapping line art of various stock Sonic modern poses. The front has a large embroidered/full color Sonic. Under the bill of the cap, you can find the modern logo on a blue background. The top shows the tag, and that the hat apparently comes in sizes. This looks like a good quality hat with lots of nice detail! This can be found at Wal Mart in 2012, and should be about 9.99 Location & price info by SonicExia
This is a "Trucker Hat" type cap. It's a certain style/variation on a baseball-cap like hat. The front panel is solid, while the rest is a screen/net type fabric with open weave. The bill is also usually shorter than that of a ball cap. The style isn't for everyone, (it can make heads look tall) but the pannel provides a nice big place for art.
In this case, the art used is cool/interesting & fresh in 2013. It's an all neo-classic look at Knuckles Tails Sonic Amy AND Eggman. They've all been refreshed with new poses & new art in the classic look. This hat is available at Spencer's gifts stores for 16.99 in 2013.
This comparison photo shows the open weave of the back of the hat, how the brim & top compare to a regular Sonic cap & reveals the little classic logo on the back. The tag looks like its from Bio World.
This is a classic cap. It's extremely simple, with just the face of Knuckles embroidered onto the front. It should be official. It is in the collection of a member of SonicTeam.