Personalized You're Overreacting Long Sleeve T-Shirt. You're Overreacting! An Erlenmeyer flask filled with bubbling green liquid. Funny gift for any chemistry geek! Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL