Patent ID: 7316985

Claim:
A shoe lining structure for a boot having an outer shell, comprising: a pair of interior linings each of which is cut into a boot shape, wherein said interior linings are stitched edge to edge together to form stitching edges, wherein said stitching edges of said interior linings are further thermoplastically seamed together to form said shoe lining structure for fitting into said outer shell of said boot, wherein each of said interior linings consist of a sheet-like waterproof and air breathable foaming cushion layer, a lining layer integrally attached to one side of said foaming cushion layer, and a cover layer integrally attached to another side of said foaming cushion layer, wherein said foaming cushion layer is made of a composition of low density polyethylene, a foaming agent including azodicarbonamide, a pigment, and additives including Zinc Oxide and Zinc Stearate integrally mixing with said low density polyethylene and said foaming agent; wherein said foaming cushion layer is made by irradiation technology wherein raw materials including said polyethylene, said azodicarbonamide, said Zinc Oxide, said Zinc Stearate, and said pigment are palletized to make a solid sheet which polyolefin molecules are crosslinked by electron-beam irradiation to form an irradiated matrix, wherein said irradiated matrix is foamed at normal atmosphere and high temperature to have water repellant and air breathable properties to obtain said sheet-like foaming cushion layer.