Brainiest happy brain t-shirt ever! FINAL SIZES, FINAL SALE! More sizes and styles over at the I Heart Guts x Threadless tee shop. Celebrate your fabulous brain with this tee silkscreened on a heather gray 90% cotton/10% poly American Apparel tee. If you wash these inside out in cold water and hang dry, the shirt will look spiffy forever. Or at least for a very long time. Made in the USA.