Abstract: A composite closure for a container has an outer band with a partial toroidal hook that overhangs a crown around the periphery of an insert cover disk. As the closure is tightened on the container, the hook bears downwardly on the crown of the disk and urges the disk against the container rim. The hook has several vents formed on its underside to enable air communication. A lower, inner edge of the hook is spaced apart from the disk to provide communication with the vents from the environment. An annular recess is formed on the underside of the hook, and is in communication with the vents and with a gap formed between an outboard wall of the crown and an inboard sidewall of the hook. A retaining bead is formed on a skirt below the hook to retain the disk. The bead is spaced apart from the disk when the closure is assembly to a container to enable communication from the environment through the vents to the threads.