Special Relativity T-Shirt for Mathematicians PhysicistsMachine wash cold with like colors, dry low heat Time dilation formula tee shirt for teachers, students, scientists studying mathematics, theory, space, general relativity. Wear this tshirt to class, college, school, the laboratory, the lab, cern, while teaching, studying, or lecturing. Lightweight, Classic fit, Double needle sleeve and bottom hem We use high quality and Eco friendly material and Inks! We promise that our Prints will not Fade, Crack