A shoe has an upper, a foot support region positioned below at least a portion of the upper to support the bottom of a user's foot, a sole secured below the foot support region, and a flexible member positioned below at least a portion of the foot support region and above at least a portion of the sole....http://www.google.fr/patents/US7114269?utm_source=gb-gplus-shareBrevet US7114269 - Athletic shoe with improved sole
