Footwear having a double-density insole

Abstract

A footwear includes an insole having a first layer for the contact of the sole of a user's foot and a second layer bonded to the first layer at a bottom side. The first layer comprises a base and a plurality of ribs raised from a top side of said base and has a hardness greater than the second layer. An outsole bonds to the bottom side of the insole for contacting the ground. When a user wearing the footwear is paddling, the insole is elastically deformed and the ribs are elastically curved to buffer the pressure applied by the user, enhancing wearing comfort.

What is claimed is: 
     
         1 . A footwear, comprising:
 an insole having a first layer for the contact of the sole of a user's foot and a second layer bonded to said first layer at a bottom side, said first layer comprising a base and a plurality of ribs raised from a top side of said base, said first layer having a hardness greater than said second layer; and   an outsole bonded to said insole at a bottom side for contacting the ground.   
     
     
         2 . The footwear as claimed in  claim 1 , wherein said first layer of said insole has a hardness within the range of 35˜40 when measured by a hardness meter in conformity with Japanese Industrial Standards JIS S 6050 or Japan Rubber Association SRIS 0101. 
     
     
         3 . The footwear as claimed in  claim 1 , wherein said second layer of said insole has a hardness within the range of 2530 when measured by a hardness meter in conformity with Japanese Industrial Standards JIS S 6050 or Japan Rubber Association SRIS 0101. 
     
     
         4 . The footwear as claimed in  claim 1 , wherein the distance between the peak of each said rib and the base of said first layer is about 2˜4 mm. 
     
     
         5 . The footwear as claimed in  claim 1 , wherein each said rib extends transversely from a left side of said insole to a right side thereof. 
     
     
         6 . The footwear as claimed in  claim 1 , wherein said ribs of said first layer of said insole are equally spaced. 
     
     
         7 . The footwear as claimed in  claim 1 , wherein said outsole comprises a front support zone and a rear support zone, said front support zone comprising two front protruding blocks for contacting the ground and a recess defined between said two front protruding blocks. 
     
     
         8 . The footwear as claimed in  claim 1 , wherein said outsole comprises a front support zone and a rear support zone, said rear support zone comprising two rear protruding blocks for contacting the ground and a recess defined between said two rear protruding blocks. 
     
     
         9 . The footwear as claimed in  claim 1 , wherein said first layer and said second layer of said insole show a hardness difference within the range of 5˜10 when measured with a hardness meter in conformity with Japanese Industrial Standards JIS S 6050 or Japan Rubber Association SRIS 0101.