Birthday design. This funny and nerdy design is the perfect comical geek present idea for B-day for your son, daughter, or any boy or girl celebrating his/her eleventh bday. It could also be a nice group design for a B-day party. This graphic design is a great geeky math joke for every eleven yrs old teen, nerd, or mathematic, algebra, physics, or science freak with cool sarcastic humor. Regardless of whether somebody likes numbers or not, this design is a cute surprise for sure. Lightweight, Classic fit, Double-needle sleeve and bottom hem