This is called the "Sonic Happy Holidays" sweatshirt.
It's another sweat shirt made to look like the popular 'ugly Christmas sweater', without being made of sweater material. This one isn't too ugly though, it's just rather busy. It has lots of different, fun snowflakes on the long sleeves. Sonic is doing a thumbs up in a red circle in the middle, while wearing a Santa hat. "Happy Holidays" is written among ribbons and white pine trees, while candy canes & bows are below. The pattern for the very large (nearly the entire front, much larger than standard designs) rest of the design is snowflakes, snowballs, rings & stripes in various holiday colors. The whole sweatshirt appears to be a dark blue, it's almost the same color as the Sonic picture.
With lots of cute designs, a different look, and a fun holiday style this Numskull design is a welcome one. It is adult sizes only, a 2019 item, and should be about 44 dollars. Find it on the Numskull Website