Personalized Earth Day Rocks T-Shirt. Earth Day T-Shirt - Tie Dye Blue to support our planet with funny and cool earth wearing sunglasses graphic says Earth Day Rocks. For conservationist, green and earth lovers. 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.