Celebrate turning the big ONE THREE in style with this unique and humorous t-shirt! This black tee features a bold white graphic of the square root of 169, cleverly referencing the age of 13. Made from a comfortable, breathable fabric, this shirt is perfect for birthday parties, casual wear, or as a fun gift for the newly minted teenager. Its classic fit makes it suitable for all body types, ensuring comfort and style. Let everyone know you're embracing the milestone with a touch of math humor. Perfect for math lovers or anyone who appreciates a good pun!