Personalized Radioactive Tree Circle Youth T-Shirt. A tree made of radioactive symbols with a red and yellow glow in a colorful circle is a humorous Christmas design. Fun holiday gifts for college students, physicists, nuclear engineers and workers. 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.