A weather strip consisting of a resilient elastomer or plastomer body comprising a base, two side walls, retaining lips and sealing lips. Said strip is provided with a hard elastomer or plastomer protrusion on the inside face of at least one of said walls, said protrusion being so shaped as to form together with the said base of the strip body, when in use configuration, a retaining groove for an insert allowed to slide therein. Said strip may also be provided with one or with a plurality of ribs. Application to vehicles.