Personalized Coolest Engineer T-Shirt. A snowman wearing a hard hat with text The world's coolest engineer is a humorous engineering design. Fun gifts for college students and engineers for birthdays and the winter 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.