Jor-El, Superman's biological father, was credited with several advances in Kryptonian technology. First, he not only discovered the Phantom Zone but also created the Phantom Zone Projector. Second, he figured out that Krypton was doom. Thirdly, he invented the Kryptonian version of mini-pizzas and lastly, he created the Superman Symbol Soft Slip-On Infant Shoes for his then infant son! Jor-El carefully packaged the Superman Symbol Soft Slip-On Infant Shoes with his son and sent them to Earth and BAM! Now we have the blue bodied / red trim Superman Symbol Soft Slip-On Infant Shoes with a raised felt red and yellow Superman symbol on the toe. Hooray for technology!