The "Atom Suit" is a fictional advanced technology worn by the character Ant-Man in the Marvel Comics universe. It allows the wearer to shrink to the size of an atom while retaining their strength and agility. The suit is equipped with various features, including a helmet that enables communication with insects and a control system for size manipulation. The Atom Suit is powered by Pym Particles, a fictional substance created by Hank Pym, the original Ant-Man. These particles enable the drastic size changes and are central to the suit's functionality. The suit's design emphasizes both practicality and versatility, making it a key element in the character's adventures.