Personalized Happy Earth Day Environment Conservation T-Shirt. Happy Earth Day T-Shirt - White has cute stitch border planet earth for celebrating our planet's beauty and encouraging conservation and renewal of our resources. 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.