Flash's Costume Ring

Flash's Costume Ring is a small ring with a spring-loaded opening. Barry Allen, the second Flash, used this ring to compress and conceal his costume while operating in his civilian identity. By thumbing a small stud on the side, the top of the ring opened, releasing the costume, allowing Barry the ability to change clothes at super-speed. Barry's grandson, Bart Allen (the current Flash) uses a similar ring to hide his costume.

See also:
 * Flash's Costume Ring appearances category