A sole for an article of footwear includes a heel area, an arch area, and a ball area, each defined on the top surface and corresponding to the respective areas of the foot. Each of the areas has a plurality of bulbous protrusions extending upwardly to contact the respective areas of the foot. A toe...http://www.google.co.uk/patents/US5400526?utm_source=gb-gplus-sharePatent US5400526 - Footwear sole with bulbous protrusions and pneumatic ventilation
