Personalized Math Teacher Funny T-Shirt. Funny Math Teacher design shows all the stuff we do each day but MATH is at the top of the list when you love to teach and it comes on a T-Shirt - Light Blue gift. Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.