A sole for an article of footwear comprising a midsole having a plurality of polygonal-shaped openings, or cavities, therein. In alternative embodiments, the sole includes reinforcement elements such as a plate disposed along at least a portion of one of the surfaces of the midsole. The plate includes...http://www.google.co.uk/patents/US7797856?utm_source=gb-gplus-sharePatent US7797856 - Lightweight sole for article of footwear
