US Patent 7913424 Footwear

A shoe structure having an exterior upper, an interior upper, an insole and an outsole. The interior upper has an upper opening with a peripheral edge at the upper end of the interior upper and a lower opening with a peripheral edge at the lower sole-side end of the interior upper, with the interior upper also having a rear or heel area, two side areas and a front area with a seam running between the upper and lower openings. The seam runs from the upper opening on the one side over the front area to the lower opening on the other side.