Personalized Monster Truck How I Roll 6th Birthday T-Shirt. 6th birthday T-Shirt - Light Blue with a cute cartoon red monster truck with giant tires, flame decal and big number 6 with dashed road stripe says This Is How I Roll. 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.