A fused article of footwear and method are provided. The method of forming the fused article of footwear includes fitting an untrimmed welt ring to a cassette configured to hold the untrimmed welt ring spaced away from an outsole midsole unit of the fused article of footwear, aligning the cassette to a sole holder, positioning an upper in contact with the untrimmed welt ring to form a cavity and injecting plastic into the cavity defined by the untrimmed welt ring, the outsole midsole unit, the upper and the cassette to form a slip sole and fuse the untrimmed welt ring, the outsole midsole unit and the upper together.

A fused article of footwear and method are provided. The method of forming the fused article of footwear includes fitting an untrimmed welt ring to a cassette configured to hold the untrimmed welt ring spaced away from an outsole midsole unit of the fused article of footwear, aligning the cassette to a sole holder, positioning an upper in contact with the untrimmed welt ring to form a cavity and injecting plastic into the cavity defined by the untrimmed welt ring, the outsole midsole unit, the upper and the cassette to form a slip sole and fuse the untrimmed welt ring, the outsole midsole unit and the upper together.