Shoe insole including a knitted spacer fabric

Abstract

A shoe insole includes a knitted spacer fabric. The knitted fabric comprises a top layer, a bottom layer, and a plurality of spacing threads extending between the top layer and the bottom layer. The spacing threads includes a monofilament yarn having a diameter of between 0.09 mm and 0.12 mm. Optionally the top layer on one of its sides, exposed to the exterior and adapted to contact a shoe wearer's foot, has been given a softer feel by a sanding treatment.

1 . Shoe insole including a knitted spacer fabric, comprising:
 a top layer;   a bottom layer; and   a plurality of spacing threads extending between the top layer and the bottom layer, wherein the spacing threads include a monofilament yarn having a diameter of between 0.09 mm and 0.12 mm.   
     
     
         2 . Shoe insole according to  claim 1 , wherein the spacing threads are looped through the top layer. 
     
     
         3 . Shoe insole according to  claim 1 , wherein the spacing threads each have a diameter of at least 0.10 mm. 
     
     
         4 . Shoe insole according to  claim 1 , wherein the spacer threads account for a density that exceeds 50% of an overall density of the spacer fabric. 
     
     
         5 . Shoe insole according to  claim 4 , wherein a proportion that the top layer attributes to the overall density, exceeds that of the bottom layer. 
     
     
         6 . Shoe insole according to  claim 5 , wherein the proportion that the top layer attributes to the overall density of the spacer fabric is substantially double to that of the bottom layer. 
     
     
         7 . Shoe insole according to  claim 1 , wherein the top layer includes multifilament polyester yarns having a thickness within a range of 140 to 250 denier, while those of similar material for the bottom layer are within a thickness range of 140-160 denier. 
     
     
         8 . Shoe insole according to  claim 1 , wherein in a thickness range of 3-5 mm of the spacer fabric, the monofilament spacer threads account for 60-65% of the weight thereof and a middle layer that has a volumetric density of between 0.10 and 0.325 g/cm3. 
     
     
         9 . Shoe insole according to  claim 1 , having a thickness of between 3 and 5 mm, and wherein the cushioning energy, measured between a top surface of the top layer and a bottom surface of the bottom layer, exceeds 60 mJ in accordance with SATRA's PM 159 test. 
     
     
         10 . Shoe insole according to  claim 1 , wherein the top layer on one of its sides, exposed to the exterior and adapted to contact a shoe wearer's foot, has been given a softer feel by a sanding treatment. 
     
     
         11 . Shoe insole according to  claim 10 , wherein the sanding treatment has consisted of subjecting the exposed surface of the top layer to two passes of sandpaper, having a coarseness value of at least 150 and not exceeding 280, while applying a moderate pressure. 
     
     
         12 . Shoe insole according to  claim 11 , wherein a first pass of the two passes is effected in a first direction and a second pass is effected in a reverse direction. 
     
     
         13 . Shoe insole according to  claim 1 , wherein the spacer fabric is additionally treated with a fabric softener. 
     
     
         14 . Shoe insole according to  claim 1 , further including a support element, laminated onto a lower surface of the bottom layer and extending from a mid foot area of the insole to a heel area of the insole. 
     
     
         15 . Shoe insole according to  claim 14 , wherein the support element on a bottom surface at its heel portion includes an additional cushioning insert. 
     
     
         16 . Shoe insole according to  claim 1 , wherein the spacing threads have at least one of a variety of opposing biases and orientations, such as to increase stability and resist lateral collapse. 
     
     
         17 . Shoe insole according to  claim 1 , that has been additionally subjected to an anti-bacterial treatment.