Personalized Biochemistry Cake Long Sleeve T-Shirt. Biochemistry is a piece of cake, unchewable, insoluble cake text with a slices of cake is a funny gift design for back to school. 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