Abstract: A composite closure for a container is disclosed which includes an outer plastic cap and an inner plastic sealing liner. Formation and retention of the sealing liner within the cap is promoted by the provision of an annular liner-retaining lip which extends inwardly from a skirt portion of a cap in closely spaced relation to its top wall portion, and thus defines an annular recess therewith, Liner retention is further enhanced by the provision of a plurality of circumferentially spaced first liner-engaging projections which are arranged in adjacent pairs within the annular recess of the cap in converging relation with each other. Liner retention is further enhanced by the preferred provision of a plurality of second circumferentially spaced liner-engaging projections extending integrally from the top wall portion of the cap in operative association with the converging adjacent pairs of the first projections.