a closure for a container is disclosed . the closure comprises a core member comprising at least one thermoplastic polymer , and at least one peripheral layer at least partially surrounding and intimately bonded to at least one surface of the core member , said peripheral layer comprising at least one styrene block co - polymer , wherein the core member has a density in the range of from about 100 kg / m 3 to 350 kg / m 3 and the peripheral layer has a density in the range of from greater than 350 kg / m 3 to about 1 , 500 kg / m 3 and a thickness in the range of from 0 . 15 mm to less than 0 . 50 mm .