Double-density elastic insert element for an outsole

Abstract

A double-density elastic insert element is composed of an inner section and an outer section enclosing the inner section. The inner section and the outer section have different density, hardness and elasticity characteristics. Preferably, the inner section and the outer section are both made of polyurethane or ethylvinyl acetate (EVA) that is solidified at different molding conditions to obtain different density, hardness and elasticity characteristics. By varying the densities of the elastic insert element, the elastic insert element can be selectively modified to have more functional capabilities to satisfy different requirements.

1 . A double-density elastic insert element for an outsole, the double-density elastic insert element comprising: 
 an inner section; and    an outer section enclosing the soft inner section, wherein the outer section and the inner section have different density, elasticity and hardness characteristics.    
     
     
         2 . The double-density elastic insert element as claimed in  claim 1 , wherein the inner section and the outer section are made of polyurethane (PU) and solidified at different molding conditions to obtain different density, hardness and elasticity characteristics in the inner section and in the outer section; and 
 the inner section and the outer section are thermally fused together.    
     
     
         3 . The double-density elastic insert element as claimed in  claim 1 , wherein the inner section and the outer section are made of ethylvinyl acetate (EVA) and solidified at different molding conditions to obtain different density, hardness and elasticity characteristics in the inner section and in the outer section; and 
 the soft inner section and the hard outer section are thermally fused together.    
     
     
         4 . The double-density elastic insert element as claimed in  claim 1 , wherein the inner section and the outer section are different colors.  
     
     
         5 . The double-density elastic insert element as claimed in  claim 1 , wherein the outer section has a density higher than a density of the inner section and is less elastic and softer than the inner section.  
     
     
         6 . The double-density elastic insert element as claimed in  claim 1 , wherein the inner section has a density higher than a density of the outer section and is less elastic and softer than the outer section.