This pair of boxers has a slightly different cut than the previous pairs, and is from Matalan (store) instead. It has black & white all-over checker pattern, with large classic style Sonic art at an odd-angle for interest. Curiously, there's a starburst and the sound effect "Bang!" written in pink behind his head. It's likely supposed to add a cartoony feel to the pair, but is underwear really the place for sound effects? Still, the over-all look of the design is rather nice.

 Photo & owned by Shadouge.

Here's a great pair for Knuckles fans too! This boxers has modern Sonic & Knuckles alternating being right-side-up, along with Sonic's name in Japanese in a smaller blue panel. There are also rings and stars on the black background to help make the pattern. It's nice to see Knuckles added in to more designs! Found at New Look in 2011 

 Photo & owned by Shadouge.

These boxers almost match a pair of pajama bottoms in pattern. They have various poses for classic style Sonic scattered around on the black background. There are also starbursts and sound effects written in various fonts. You can see "Ka-blam" and "Splat" written in various places. Found at New Look in 2011. 

 Photo & owned by Shadouge.

This pair of boxers combines something new (modern Sonic) with something more a staple of classic items (the round star bumper) The red background makes Sonic's shoes a little confusing here, but you can certainly pick him out among the gray & white star bumper shapes. He's scattered all around at a size that almost makes these a bit busy, though. Found at New Look in 2011. 

 Photo & owned by Kari

Another colorful, classically styled pair of underwear. This one has the new/classic style jumping Sonic art, among various screen-tone dotted starburst shapes. The back is decorated with the classic logo, so this is interesting from any angle. These can be found at River Island store in 2011 Summer, & should be around 12 pounds.

 Photographed & owned by Kari

Here are 2 more great pairs of Sonic underwear. The first is classic style running Sonic with colorful after-images/outlines & 'sparkle' logo. It has "Sonic" written in the elastic around the waist band. The second is a bit busy-er with variously cropped classic Sonic art in rectangles as an all-over pattern. This one has his name on the band too. Both underwears can be found at Marks & Spencers stores.