Sandwich-type footwear stiffening element of rigid or at least semi-rigid behaviour usable as part of the sole unit or insole

摘要

For use in the present invention is footwear (2, 3) of the lower as a (4), a window unit, or the insole or inner side from the support of the footwear having a bump (7) in combination with footwear bottom (4) provides the element with a suitable rigid or semi-rigid. The element (1) is greater in rigidity than provided, and the outer side (13, 14) has a medial side 15, a three or more mutually coupled to define a sandwich structure (1A) layer portion 13, 14 and 15, these portions They are bonded together stably to form a single body (1A).