Abstract: An apparatus comprising a mould (11) having a first mould part (20) and a second mould part (21), the second mould part (21) being movable relative to the first mould part (20), foam supply means to supply foam to said mould, and a positioning tool (10) for positioning a covering (14) in at least one of the first mould part (20) and the second mould part (21) wherein the positioning tool (0) is shaped to co-operate with aid at least one mould part, characterised in that the positioning tool (10) is provided with a groove (13) whereby a projecting part (18) of the covering (14) may be received in the groove (13).