Method and system for an article of footwear with fused construction

A fused article of footwear, comprising:

• an upper;
• a welt ring circumferentially surrounding a lower edge of the upper;
• an outsole midsole unit including a top portion formed of a midsole and a bottom portion formed of an outsole;
• and
• a slip sole fixedly positioned between the upper and the midsole and fused to the midsole, the welt ring, and the upper.

A system for forming a fused article of footwear, comprising:

• a sole holder including a holding ring configured to hold an outsole midsole unit of the fused article of footwear and an outer surface circumferentially surrounding the holding ring;
• a cassette aligned with the sole holder, wherein a bottom edge of the cassette rests on the outer surface of the sole holder and the cassette holds an untrimmed welt ring spaced away from the outsole midsole unit;
• and
• an upper positioned above the cassette, wherein a lower edge of the upper is in face sharing contact with the untrimmed welt ring, wherein the outsole midsole unit, the cassette, the untrimmed welt ring, and the upper define a cavity configured to receive a plastic to fuse the fused article of footwear and form a slip sole.