Personalized 4th Birthday Boy Checkered T-Shirt. Celebrate a special 4th birthday with this fun checkered design, perfect for any birthday boy. Ideal for parties. this T-Shirt - Vintage Black adds a festive touch to any celebration. 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.