Personalized Distressed Ruler Long Sleeve T-Shirt. I am the ruler in distressed text with a ruler replacing the letter L in ruler is a funny gift design for mathematicians and mathh teachers at back to school, birthdays and holidays. 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