The invention is directed to a midsole for a shoe including one or more foam columns disposed between an upper and a lower plate. One or more elastomeric foam elements are disposed between the upper and lower plates. The foam elements are made of a material such as microcellular polyurethane-elastomer...http://www.google.co.uk/patents/US5353523?utm_source=gb-gplus-sharePatent US5353523 - Shoe with an improved midsole
