Patent ID: 8793902

Claim:
Footwear comprising: an upper sized and shaped for covering a human foot of a predetermined size, said upper having a lower edge defining a lower boundary of the upper and an upper edge defining an opening through which the foot is inserted when positioning the footwear on the foot; a unitary waterproof vapor-permeable sheet having an outer edge defining a shape corresponding to the foot stitched to the lower edge of the upper so that an interior surface of the upper and an upper surface of the sheet define an interior of the footwear into which the foot is inserted, said upper surface of the sheet forming a bottom surface of the interior of the footwear; and a compliant sole attached to the upper and extending below the waterproof vapor-permeable sheet, the sole extending longitudinally between a forefoot section positioned for underlying a forefoot of a wearer and a heel section positioned for underlying a heel of the wearer, said compliant sole having a sidewall, a lower surface forming an exterior bottom surface of the footwear, and an upper surface opposite the lower surface, the upper surface having elongate channels extending laterally across the upper surface, each of the channels having a width measured longitudinally with respect to the sole that varies along a length of the respective channel, and the sidewall having ports permitting air to flow between the elongate channels and an ambient atmosphere outside the sole.