This funny and nerdy design is the perfect comical geek present idea for everyone celebrating to become 21 yrs old. It could also be a nice group design for a party. This graphic design is a great geeky math joke for every nerd, teacher, 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