An arch support device has a lower layer of a rigid or semirigid material shaped to conform to the arch of a wearer's foot and to provide an arch supporting function when inserted in a shoe, a second layer of cushioning material such as foam secured to the upper face of the lower layer; and a third, cover layer of pliable material secured over the second layer. The foam layer is of variable thickness, with a maximum thickness in a heel region and a minimum thickness in a toe region.