Spreadshirt Calculus Yes, It's Rocket Science Women&rsquo;s Premium T-Shirt Designed and printed in the USA. For some it's just math, for others it's rocket science. Wear your nerd power with pride with this awesome design! Also makes a great gift for lovers of calculus. The headliner of the Spreadshirt Collection is our premium t-shirt. This is as perfect as perfect gets: it's soft yet stretchy, a little longer than a standard tee and figure-flattering. 100% cotton (except for heathered colors); Fabric weight: 5.29 oz (midweight). For best results and to maximize durability machine wash cold, inside out and tumble dry on low heat. Official sizing (width x length measured in inches): S (17.5" x 26") | M (18.5" x 26.5") | L (20" x 27") | XL (21.5" x 28") | XXL (22.5" x 29") | 3XL (24" x 29.5").