Abstract: The invention relates to a plastic insole comprising a curve support for the metatarsus. Provided in the region of the greatest height of the curve support on the underside of the insole are a plurality of longitudinally extending stiffening ribs as well as grooves, said grooves extending from the toe region in the direction of the heel as far as the metatarsal region and so curving round in the metatarsal region to the lateral side of the insole and terminating in said region that extending between the grooves are spring strips issuing from each of the toes, wherein material can be removed from the spring strips and stiffening ribs in order individually to adapt the thickness thereof.

Abstract: The invention relates to a plastic insole comprising a curve support for the metatarsus. Provided in the region of the greatest height of the curve support on the underside of the insole are a plurality of longitudinally extending stiffening ribs as well as grooves, said grooves extending from the toe region in the direction of the heel as far as the metatarsal region and so curving round in the metatarsal region to the lateral side of the insole and terminating in said region that extending between the grooves are spring strips issuing from each of the toes, wherein material can be removed from the spring strips and stiffening ribs in order individually to adapt the thickness thereof.