True math geeks will appreciate the humor of this shirt. Pi the great mathematical constant and its imaginary counterpart “i” unite in this funny t-shirt. It’s also got an amazing look with blue graphics on a heather gray background. We love the fact that it is minimalist in design and meditative in effect. These fabulous t-shirts are made of sturdy, heavyweight, preshrunk cotton. Machine wash cold. Sizes are S, M, L, XL, and XXL (+$2.00).