Bi-material shoe bottom with foam insert

Abstract

Disclosed is a shoe made with a soft, flexible, bi-material bottom, of which the first layer, directly in contact with the ground, is made of TPU, or leather or other material, while the second layer, laid on top of the said first tread layer, is made of PU, or leather or other material, with a PVC film and has inside it a foam insert made of open-cell expanded polyurethane that makes the shoe comfortable and is able to absorb and cushion shocks during ambulation.

1 . Bi-material shoe bottom comprising a first tread layer made of TPU or leather or other material, a second layer made of PU or leather or other material laid on top of the said first layer and a PVC film placed between the first tread layer and the second layer, characterized in that the second layer has inside it an insert made of open-cell expanded polyurethane that has a higher density in the heel area than in the sole and plantar arch area. 
     
     
         2 . Bi-material bottom according to  claim 1  characterized in that the said open-cell expanded polyurethane has a density ranging from 50 kg/m 3  to 75 kg/m 3  in the sole and plantar arch area and from 95 kg/m 3  to 120 kg/m 3  in the heel area. 
     
     
         3 . Bi-material shoe bottom comprising a first tread layer made of TPU or leather or other material, a second layer made of PU or leather or other material laid on top of the said first layer and a PVC film placed between the first tread layer and the second layer characterized in that, the second layer has inside it an insert made of open-cell expanded polyurethane having a single density for both the heel area and the sole and plantar arch area. 
     
     
         4 . Bi-material bottom according to  claim 1  characterized in that the second PU layer has holes made on its outer edge that form a locking system for the said open-cell expanded polyurethane. 
     
     
         5 . Bi-material bottom according to  claim 3 , characterized in that the second PU layer has holes made on its outer edge that form a locking system for the said open-cell expanded polyurethane.