Your favorite team number? Or better yet, does a bit of sexual innuendo framed in context by sport's style number lettering interest you? It seems after number seven, everyone's favorite number is 69 (SIXTY NINE). I wonder why? (Hint: If you're upside-down while wearing this shirt, it still reads as 69.) Regardless of the reason, sports team numbering is the ideal shirt for any type of sport or game, both outdoor and indoor.