Personalized 1st Earth Day Holiday Boys T-Shirt. My 1st Earth Day T-Shirt - White for a little boy. Cute conservation and environment celebration party wear for kids. 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.