Flash's costume ring

Flash's costume ring is a fictional item featured in comic books published by DC Comics. It is associated with the Flash line of titles. The character of Barry Allen, aka the Flash, wears a golden-colored ring on his left hand. By triggering a switch on the side, the top of the ring opens releasing his compressed costume, which rapidly expands upon contact with the air. How the hell he gets it back into the ring is anybody's guess.