Square Root of 1600 – 40th Birthday 40 Years Old Gift Shirt-T-Shirt

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 1600 – 40th Birthday 40 Years Old Gift T-Shirt, Makes a great birthday gift for son, daughter, granddaughter, cousin, niece, nephew, mom, dad, mother, father, uncle, aunt or friend who is turning 40 years old. geek geeky nerd nerdy math algebra mathematics science present born in 1976 1977 1978 quote textual saying pun cool gift ideas joke humor funny sarcastic, Lightweight, Classic fit, Double-needle sleeve and bottom hem