100% Cotton Exclusive T Shirt from Underground Printing, Printed and Designed in the USA. Unisex fit that’s Perfect for Men and Women. Great addition to any wardrobe. Products include an official UGP Hang tag or sticker and are produced by Underground Printing. Any product not containing this tag is counterfeit. If you’re ever feeling stressed just remember this favored rhyme from the Sheldon on that hit tv show. Machine washable (We suggest you wash inside out for a longer lasting print). Great for Christmas gifts, birthdays or just to treat yourself to a great graphic tee. You’ll be a big laugh with your fellow scientists while wearing this great graphic t-shirt depicting the rhyme from that hit tv show. Printed on Gildan 5000 Heavy Cotton Tee – 5.3-6.0 oz., pre-shrunk 100% cotton. Heather and neon colors are 50/50 cotton/polyester, Antique heather colors and Sport Grey are 90/10 cotton/polyester, Ash is 99/1 cotton/polyester. 100% Satisfaction Guarantee, Available in S – 3XL This tee runs true to size and is pre-shrunk.