Personalized Earth Day Earth T-Shirt. Earth with the text Earth Day is a fun gift design for students, teachers, scientists and environmentalists at back to school, birthdays, holidays and Earth Day. 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.