A method of adjusting the weight of footwear sole

A method of adjusting the weight of footwear sole, including assembly of a hollow structure footwear midsole filled with flowable particles. Said hollow structure footwear midsole is defined by at least an upper surface, a lower surface and a side surface, The stiffness of said hollow structure be decided by at least a recesses, which composed with at least a supporting surface and deployed around the inner region of said hollow structure. Said flowable particles shaped with geometrical pattern to reduce the friction between each other. The material of said particles can be material with some how heavy weight, such as metal, non-metal, plastic, rubber, ceramic. Glass etc. The characteristic of said flowable particle, which deployed in the inner space of said hollow structure, provide a function of dispersing the reaction from the footwear sole. The characteristic of reaction from the footwear sole will be also decided by the number as well the deployed regions of said flowable particles.