The invention concerns a closure for sealing of an orifice of a neck of a container. The closure comprises a top portion, an outer skirt and a sealing means. The sealing means comprises an outer sealing means suitable to be engaged with an outer free peripheral surface of neck. The outer sealing means comprises an annular base radially distanced to said outer skirt and at least one annular sealing ring protruding radially inwardly over said base.