A midsole having a bellows type of shock absorbing air bag and a method for preparation of such a midsole. The present midsole comprises a hexahedral-shaped air bag for absorbing an outer shock and comprising upper and lower parts which are provided with a plurality of vertical bellows members, a plurality...http://www.google.fr/patents/US5224278?utm_source=gb-gplus-shareBrevet US5224278 - Midsole having a shock absorbing air bag
