This rare shirt features more of that unusual "X-Treme" Sonic art. This art appeared on a mini book in the USA and at least 1 Australia pin. It is characterized by being colored lines on a dark background with no shading. Sonic is participating in a sport of some kind (Hang Gliding, Soccer, etc) in the art. WAS it truly made for the unreleased "Sonic XTreme" game, or was it just a name that was a coincidence? (The always sports theme points more toward coincidence, as sports weren't to be featured in the game)
Here, Sonic's shoes have been given yellow cleats and he is in a soccer/football outfit (complete with head scarf?) and is shown kicking the ball through a smoke-ring. 'Flames' are drawn behind it to show it's fast.