Abstract: An item of footwear such as a shoe comprises an outer sole which may include an intermediate mid sole, an upper having an insole with a cavity between the outer sole or mid sole. The cavity receives injected into it cushioning resilient foam material which may extend into a heal portion of or to the outer sole of a multi-layer sole and heel unit. In the method of manufacture and after the assembly of the shoe with the empty cavity, the resilient material is subsequently injected into the cavity e.g. through a small bore in the outer sole or elsewhere. Vent hole enable air to escape from the cavity to ensure full and intimate filling of the cavity with the foam material. The upper may be retained on a last during injection to maintain a desired profile of the insole. Quantity and/or pressure of the injected material may be varied for obtaining different degrees of cushioning.