Periodic Table Science Geek Nerd Fun T Shirt Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat A Periodic Table of the Elements Science or Chemistry, Nerdy, Fun shirt. For men, women, and youth. This tee is perfect for a birthday, Christmas, graduation, or any gift giving occasion. Lightweight, Classic fit, Double-needle sleeve and bottom hem