They're like seven inches tall. Even knowing that, they still feel pretty huge to me. Yup, I got both Sonic and Shadow today. The only complaint I have with Shadow is that he has an asymmetrical head; the gills on the other side of his head stretch out farther to the side than on the other. Sonic has no such problem, but I faced two problems: 1) His left elbow had been bent out of shape in the packaging, forcing me to use some hot water to bend it back into the right position, but it's still a bit stretched out and doesn't look as pretty as the right arm, and 2) His head seems almost like it was glued on. I tried to turn it by force but accidentally snapped off one of the fins on his back which I had to glue back on. Still trying to figure out what to do with Sonic's unturning head, though.
Actually those are these stylized shoes designed by a company called Soap designed for this weird-assed fad called "freestyle walking". When Sonic Adventure 2 came out, Sega had some sort of marketing tie-in with Soap.