Personalized Trump 45 IQ T-Shirt. Trump 45 - That's his IQ. Trump will tell you lots of things. He will tell you he's smart. Don't believe it! The 45 stands for his IQ. Everyone loves our Custom T-Shirts! 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.