The invention is a system for modifying characteristics of an article of footwear, particularly the sole structure. The footwear may include a plurality of discrete, vertically-projecting, columnar elements that extend between upper and lower portions of a cavity formed in the sole structure. At least...http://www.google.com.tw/patents/US7082698?utm_source=gb-gplus-share專利 US7082698 - Article of footwear having a sole structure with adjustable characteristics
