The suit was made of a flexible titanium-lead alloy, and topped by a helmet with a transparent leaded-polycarbonate faceplate. As Hamilton wryly pointed out, these materials were not only leaded enough to block Kryptonite radiation, but also durable enough to withstand one of the Man of Steel's average days.
Hamilton also treated the suit with a traceable radioactive coating that allowed him to track Superman's location, even after Superman was sent into the Phantom Zone.
On two occasions, Superman used the suit to safely handle Kryptonite, allowing him to wield it against other beings vulnerable to its radiation: Parasite and Mala. On two others, he donned the suit to face enemies who he knew carried Kryptonite: Metallo and The Joker. During this latter encounter, the suit was dissolved by acid from Joker's boutonnière. It was later replaced by the time Superman fought Bizarro.