Here are 3 different long sleeve boys Sonic shirts. (A plain long sleeve, not the double sleeve) The first has Sonic spelled repeatedly front & backwards while a close up CG Sonic face only appears in the letters, giving him an abstract look. The other 2 tees are variants of eachother. One is a bright blue, the other a dark navy. Notice also that the designs are similar, featuring square portraits with close ups of Tails, Sonic & Kncukles while CG art of Sonic leaps through some yellow designs. However, the Sonic square portrait is gray on the lighter shirt, and blue on the darker one. Each shirt has the Sonic logo/copyright cloth tag in the neck.
These were released in Winter 2016.
And that's important! A company still has a modern license, if this is true. Boom has been obliterating companies holding modern licenes for products, so it's important that these nice modern tees got made. (Modern Sonic imagery is becoming scarce in 2016.