An ultra-thin liquid-filled insole interface for use in footwear is provided. The ultra-thin liquid-filled insole interface can be removable or fixed to an article of footwear, especially to protect against friction or shear forces. ...http://www.google.es/patents/US20060026864?utm_source=gb-gplus-sharePatente US20060026864 - Ultra-thin liquid-filled insole interface
