This is a Sonic X themed shirt, which uses the 'jumping' art for both Sonic & Shadow. They're faced opposing eachother, with some random yellowish explosions in the foreground & background. Is it to imply a clash? Shadow's name is at the top in a different font. The shirt looks a bit washed out, but that's because a ray of sunlight is falling directly on it in the photo. This was released during (not at the start of) Sonic X.