The Happy Wheels t- shirt features Irresponsible Dad with his son riding on his shoulders. The shirt only comes in one color, which is light blue. They come in Small, Medium, Large, Extra Large, and x2 Extra Large, and x4 Extra Large, and they're all sold for $20.00. They have recently been re-stocked so all sizes are again available. The shirt is sold at Newgrounds and is manufactured by American Apparel.