A method for making, by injection molding, a waterproof footwear product comprising an attached compressible microcellular lining material wherein the compressible microcellular lining material is attached during the injection molding step, the method comprising: (a) providing a last having an exterior surface which corresponds to an interior surface of the footwear product, (b) covering at least a portion of the exterior surface of the last with a compressible microcellular lining material; (c) providing a first mold suitable for injection of a molten injection material into an injection cavity to form the footwear product wherein the first mold comprises first and second plates, and first and second shells; (d) locating the compressible microcellular lining material covered last in the first mold between the first and second shells with the first and second plates on opposite sides of the shells, and closing the plates in position for injection molding so that the shells form a pre-injection cavity between the shells and the compressible microcellular lining material covered last; (e) injecting under pressure an injection material into an injection cavity, which defines the configuration of the footwear product between the shells and the lining covered last when the plates are tightly closed, until the injection cavity is filled with the injection material whereby the injection pressure causes the compressible microcellular lining material to compress and thereby reconfigure from the pre-injection cavity to the injection cavity; (f) allowing the injection material to harden in the injection cavity, whereby the hardened injection material attaches to the compressible microcellular lining material to form the waterproof footwear product over the last; (g) opening the first mold, the plates and shells and expose the footwear product; and (h) removing the footwear product from the last. (a) providing a last having an exterior surface which corresponds to an interior surface of the footwear product, (b) covering at least a portion of the exterior surface of the last with a compressible microcellular lining material; (c) providing a first mold suitable for injection of a molten injection material into an injection cavity to form the footwear product wherein the first mold comprises first and second plates, and first and second shells; (d) locating the compressible microcellular lining material covered last in the first mold between the first and second shells with the first and second plates on opposite sides of the shells, and closing the plates in position for injection molding so that the shells form a pre-injection cavity between the shells and the compressible microcellular lining material covered last; (e) injecting under pressure an injection material into an injection cavity, which defines the configuration of the footwear product between the shells and the lining covered last when the plates are tightly closed, until the injection cavity is filled with the injection material whereby the injection pressure causes the compressible microcellular lining material to compress and thereby reconfigure from the pre-injection cavity to the injection cavity; (f) allowing the injection material to harden in the injection cavity, whereby the hardened injection material attaches to the compressible microcellular lining material to form the waterproof footwear product over the last; (g) opening the first mold, the plates and shells and expose the footwear product; and (h) removing the footwear product from the last.