I Wear this Shirt Periodically T-shirt funny science tshirt 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 This t-shirt features a whole scientific Periodic Table of Elements in vibrant colors of bright blue, yellow, green, red and lilac purple. Beneath this chemistry chart is the funny, ironic humorous science-pun text that reads: I wear this shirt periodically. This tshirt would make a fun gift for anyone who loves science, chemistry, physics or biochemistry, be it a high school student, college or university undergrad or graduate majoring in chemistry, physics or science, or even for a professional chemist working in research, or physicist researcher. It's great for anyone who appreciates sci geek / nerd humor and word play! Lightweight, Classic fit, Double-needle sleeve and bottom hem