The Komfit/JB band was made to be easily adjustable, flexible, and capable of fitting just about anyone.  Strapped to the wrist one moment, it could be resized in seconds, or, in the case of emergency, removed with the flick of a finger.  As a result, NASA astronauts were permitted to wear the bracelet, and they routinely did so during the Mercury, Gemini, and Apollo periods.  Like the watch with which it was often worn (the Omega Speedmaster), the Komfit/JB band quickly became synonymous with the NASA space programs.