Personalized Earth Day Wind Power Conservationist T-Shirt. Environment conservation Earth Day T-Shirt - White with wind power it's green electricity production apparel. 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.