Personalized Never Underestimate an Old Man With A Skateboard T-Shirt. Whether you're a skateboard enthusiast or just love a good laugh, this print design is a great addition to your wardrobe. Show off your personality and embrace the spirit of adventure with this eye-catching apparel. 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.