Patent ID: 7043788

Claim:
A method of making a waterproof footwear liner, comprising the steps of: providing two sides, each side having an outer layer, an inner layer, and an intermediate layer, the intermediate layer being impermeable to water and permeable to vapor, the sides defining a lower edge and a perimeter adjacent to the lower edge; sealingly connecting the two sides together at a front seam and a back seam; providing an inner bottom piece having a border; stitching the border of the inner bottom piece to the two sides along a bottom seam to form a partial enclosure, the partial enclosure having an open top portion, a toe portion, a heel portion, and a sole portion, the perimeter of the sides and the inner bottom piece cooperating to form the sole portion; providing an outer bottom piece comprising an outer layer and an inner layer, the inner layer being impermeable to water and permeable to vapor, the outer bottom piece being sized to extend outwardly beyond the bottom seam in overlapping relationship to the perimeter of the sides; and adhering the outer bottom piece to the inner bottom piece and the overlapped perimeter of the sides to form a waterproof seal between the outer bottom piece and the sides.