In the overmoulding of an article channels are provided in the surface of the article to guide the flow of the overmoulding material, in addition holes may be provided across the article to enable flow of the overmoulding material to the side of the carrier remote from the point of injection. The techniques are particular useful in the overmoulding of articles having a lattice or honeycomb structure particularly when produced by injection moulding. When the overmoulding material is foamable the overmoulded articles may be used as acoustic baffles or structural reinforcement for automobiles.