Thread Science Holy Shift Math Funny Calculus Sarcastic Pun Physics Adult Men&rsquo;s Humor T-Shirt 100% Cotton Printed in the USA. 50/50 poly/cotton soft touch blend. Mens Unisex Adult Sizing, Heather Black, Tearaway label Machine washable: Machine wash warm inside out with like colors. Tumble dry medium. Exclusive Thread Science design. If youre a fun wife looking for great birthday mens apparel ideas for a husband, a parent trying to find the perfect awesome novelty gag graphic t-shirt present for a son or daughter, or a teenager searching for fun cool vintage retro and classic clothes, we offer top quality soft touch tees and merchandise that are sarcastic, witty, old school, interesting, clever and unique. Surprise gifts for everyone; teachers, students, friends, coworkers, and neighbors. Our fashion tshirts use sarcasm and are always hilarious. These shirts make awesome additions to any wardrobe. Our mens and womens designs are great for holidays; Christmas, Fathers Day, Mothers Day, Halloween, Valentines Day, Saint Patricks Day, Thanksgiving, New Years, Easter, Hanukah and the 4th of July. The perfect family idea for a brother or sister, mom or dad, uncle or aunt, or grandma and grandpa. Share our designs, puns and laughs with that special person or people in your life. "Holy shift! Look at the asymptote on that mother function!"