Expression Tees Never Trust an Atom Mens T-Shirt 100% Pre-shrunk Cotton Physics and Chemistry jokes and puns never go out of style Making bad chemistry jokes because all the good ones Argon. Printed and designed in the U.S.A. using top quality garments for comfort and style. We use state of the art equipment to ensure vibrant colors and lasting durability on every piece of clothing apparel we sell Our professionally printed Men's T-shirts are 6 oz. preshrunk 100% cotton jersey knit, with taped neck and shoulders, double-needle sleeve and bottom hems, for a comfortable fit and feel. Recommended Care Instructions - Machine wash cold, inside out, with like colors. Only non-chlorine bleach. Tumble dry medium. Do not iron. Do not dry clean. Makes a perfect gift for Christmas, Birthdays or any Holiday or special event