Square Root of 169: 13th Birthday 13 Years Old T-Shirt-FL

Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 65% Cotton, 35% Polyester, Imported, Machine wash cold with like colors, dry low heat, Square Root of 169 13 yrs 13yrs yr best 13th Birthday Years Old b-day bday geek nerd geeky nerdy math mathematic algebra science present pun born in 2004, quote textual saying cool gift ideas joke funny humor sarcastic, Lightweight, Classic fit, Double-needle sleeve and bottom hem