A closure mechanism receiving aperture presents a substantially contiguous, uninterrupted planar surface on a flexible medium, primarily for use with identification devices, i.e., wristbands. The aperture does not interrupt the printable area so that printer ink may be printed over the aperture without passing through. The inventive aperture also does not produce waster material or chads which can jam or foul-up a printer. An inventive wristband includes both snap closure and adhesive closure mechanisms that can be used at the same time.