Personalized World's Coolest Chemist T-Shirt. World's coolest chemist text with a snowman holding a bubbling beaker is a funny design for chemists, students and teachers at birthdays and holidays. 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.