Personalized Happy Earth Day Environment Conservation Youth T-Shirt. Happy Earth Day Youth T-Shirt - White has cute stitch border planet earth for celebrating our planet's beauty and encouraging conservation and renewal of our resources. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.