Compound structure of mid-sole and insole

Abstract

A compound structure of mid-sole and insole is disclosed. A PU outer sole is made into a trough shape in order to reduce the use of PU and thus the weight thereof. The mid-sole and insole are made as a compound of a lightweight material, such as EVA, and disposed inside the trough. The invention thus provides best comfort to the user while the total weight of shoe is effectively reduced.

What is claimed is: 
     
         1 . A compound structure of mid-sole and insole disposed in a trough formed on an outer sole, the compound structure being made of a lightweight material to reduce the total weight of a shoe and to provide comfort by absorbing vibrations. 
     
     
         2 . The compound structure of mid-sole and insole of  claim 1 , wherein he material of the outer sole is PU with a density of about 0.6. 
     
     
         3 . The compound structure of mid-sole and insole of  claim 1 , wherein the lightweight material of the mid-sole and insole is EVA with a density of about 0.2. 
     
     
         4 . The compound structure of mid-sole and insole of  claim 3 , wherein the mid-sole is made of EVA or a mixture of EVA and corkwood with a hardness between 65 and 70. 
     
     
         5 . The compound structure of mid-sole and insole of  claim 3 , wherein the surrounding frame of the insole is made of EVA with a hardness between 50 and 55. 
     
     
         6 . The compound structure of mid-sole and insole of  claim 3 , wherein the insole body is made of elastic EVA with a hardness between 40 and 45. 
     
     
         7 . The compound structure of mid-sole and insole of  claim 3 , wherein the area of the insole body corresponding to the inner side of the forefoot is made of vibration-absorbing EVA with a hardness between 40 and 45.