Air-cushioning sole insert lined with iridescent film

A sole insert including: an iridescent film translucent or transparent lined on or in a transparent outer wall of an air-cushioning pad of a sole insert inserted in a shoe sole, and a color sheet covering and combinable with the air-cushioning pad, whereby upon a molding process of the pad with the color sheet to form a recess recessed in the pad and to form an inner wall revealing a background color inside the pad in contrast to the outer wall reflecting the iridescent colors from the iridescent film as lined on or in the outer wall. It will greatly enhance a decorative effect and visual interest for the wearer.