Personalized Unicorn Earth Day T-Shirt. Earth Day T-Shirt - Vintage Black to support our planet Earth Day gifts with cute unicorn wearing a floral wreath and pretty eyelashes graphic says Earth Day. For conservationists, green and earth lovers. Everyone loves our Custom T-Shirts! 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.