Removable shoe insole

Abstract

An insole liner for a shoe is disclosed. The liner consists of a wedge shaped member having opposite back and front ends, a top surface and a bottom surface. The liner has a polyurethane base layer, a middle layer made of silicone gel and a top layer made from memory foam. The wedge shaped member has a thickness which tapers from the back end towards the front end. The base layer has a shore hardness which progressively decreases from the back end of the wedge shaped member to the front end of the wedge shaped member and wherein the middle layer has a shore hardness which progressively increases from the back end of the wedge shaped member to the front end of the wedge shaped member. Finally, the bottom surface has a plurality of projections.

Therefore, what is claimed is: 
     
         1 . A removable insole liner for a shoe comprising:
 a. an integrally formed wedge shaped member having opposite back and front ends, a top surface and a bottom surface, the wedge shaped member having a base layer towards the bottom surface, a top layer towards the top surface and a middle layer interposed between the base and top layers;   b. the base layer formed from polyurethane infused with particles of natural cork, the middle layer formed from silicone gel, and the top layer being formed from memory foam, the upper layer and base layer being integrally bonded to the middle layer;   c. the base layer having a thickness which tapers from 2.5 cm from the back end of the wedged shaped member to 0.4 mm at the front end of the wedged shaped member, the middle layer having a thickness which tapers from 0.7 cm from the back end of the wedged shaped member to 0.6 mm at the front end of the wedge shaped member, the top layer having a uniform thickness of 6 mm from the back end of the wedge shaped member to the front end of the wedge shaped member, and   d. the bottom surface having a plurality of projecting ridges.   
     
     
         2 . The insole liner as defined in  claim 1  wherein the particles of cork are between 2 mm to 0.1 mm in diameter, the particles of cork being interspersed throughout the base layer, the base having a cork concentration between 1% to 10% of the volume of the base layer. 
     
     
         3 . The insole liner as defined in  claim 2  wherein the cork concentration of the base layer is selected to give the base layer a shore hardness of between 35 to 55. 
     
     
         4 . The insole liner as defined in  claim 3  wherein the shore hardness of the base layer decreases from 55 at the back end of the wedge shaped member to 35 at the front end of the wedge shaped member. 
     
     
         5 . The insole liner as defined in  claim 1  wherein the base layer is configured to have a shore hardness which decreases from 55 at the back end of the wedge shaped member to 35 at the front end of the wedge shaped member. 
     
     
         6 . The insole liner as defined in  claim 5  wherein the middle layer is configured to have a shore hardness which increases from 3 at the back end of the wedge shaped member to 7 at the front end of the wedge shaped member and wherein the top layer has a uniform shore hardness ranging between 7 to 9. 
     
     
         7 . The insole liner as defined in  claim 1  wherein the base layer has a composition configured to give the base layer a shore hardness which progressively decreases from the back end of the wedge shaped member to the front end of the wedge shaped member and wherein the middle layer has a composition configured to give the middle a shore hardness which progressively increases from the back end of the wedge shaped member to the front end of the wedge shaped member and wherein the top layer is configured to have a substantially uniform shore hardness. 
     
     
         8 . A removable insole liner for a shoe comprising:
 a. an integrally formed wedge shaped member having opposite back and front ends, a top surface and a bottom surface, the wedge shaped member having a base layer towards the bottom surface, a top layer towards the top surface and a middle layer interposed between the base and top layers;   b. the base layer formed from a polyurethane plastic, the middle layer formed from silicone gel, and the top layer being formed from memory foam, the upper layer and base layer being integrally bonded to the middle layer;   c. the base layer having a thickness which tapers from 2.5 cm from the back end of the wedged shaped member to 0.4 mm at the front end of the wedged shaped member, the middle layer having a thickness which tapers from 0.7 cm from the back end of the wedged shaped member to 0.6 mm at the front end of the wedge shaped member, the top layer having a uniform thickness of 6 mm from the back end of the wedge shaped member to the front end of the wedge shaped member;   d. the base layer having a composition configured to give the base layer a shore hardness which progressively decreases from the back end of the wedge shaped member to the front end of the wedge shaped member and wherein the middle layer has a composition configured to give the middle a shore hardness which progressively increases from the back end of the wedge shaped member to the front end of the wedge shaped member and wherein the top layer is configured to have a substantially uniform shore hardness, and   e. the bottom surface having a plurality of projecting ridges.   
     
     
         9 . The insole liner as defined in  claim 8  wherein the particles of cork are between 2 mm to 0.1 mm in diameter, the particles of cork being interspersed throughout the base layer, the particles of cork comprising between 1% to 10% of the volume of the base layer. 
     
     
         10 . The insole liner as defined in  claim 9  wherein the base layer is configured to have a shore hardness which decreases from 55 at the back end of the wedge shaped member to 35 at the front end of the wedge shaped member. 
     
     
         11 . The insole liner as defined in  claim 10  wherein the middle layer is configured to have a shore hardness which increases from 3 at the back end of the wedge shaped member to 7 at the front end of the wedge shaped member and wherein the top layer has a uniform shore hardness ranging between 7 to 9. 
     
     
         12 . An insole liner for a shoe comprising:
 a. an integrally formed wedge shaped member having opposite back and front ends, a top surface and a bottom surface, the wedge shaped member having a base layer towards the bottom surface, a top layer towards the top surface and a middle layer interposed between the base and top layers;   b. the base layer formed from a polyurethane plastic, the middle layer formed from silicone gel, and the top layer being formed from memory foam, the upper layer and base layer being integrally bonded to the middle layer;   c. the wedge shaped member having a thickness which tapers from 4 cm at the back end of the wedge shaped member to 1.5 mm at the front end of the web shaped member, each of the base layer and middle layer having a thickness which tapers from the back end of the wedged shaped member the front end of the wedged shaped member, the top layer having a uniform thickness from the back end of the wedge shaped member to the front end of the wedge shaped member;   d. the base layer having a composition configured to give the base layer a shore hardness which progressively decreases from the back end of the wedge shaped member to the front end of the wedge shaped member and wherein the middle layer has a composition configured to give the middle a shore hardness which progressively increases from the back end of the wedge shaped member to the front end of the wedge shaped member and wherein the top layer is configured to have a substantially uniform shore hardness, and   e. the bottom surface having a plurality of projections.   
     
     
         13 . The insole of  claim 12  wherein the base layer has a shore hardness which varies between 55 and 35 and wherein the middle layer has a shore hardness which varies between 7 and 3 and wherein the top layer has a shore hardness of between 7 to 9.