Patent ID: 6836976

Claim:
A waterproof and collapsible article of footwear, comprising: an internal, thin, and flexible and foldable insole having one or more layers of insulating material; an external, flexible and foldable sole pad having a top face and a bottom face opposite to said top face, said top face of said sole pad supporting said insole, said sole pad having a construction and arrangement providing protection from rough surfaces that are traversed by said article of footwear; a three-layer collapsible upper having an outer layer of flexible material, a middle layer of flexible material and an inner layer of flexible material, said outer layer of material being both waterproof and breathable, and said inner layer of material being both moisture wicking and insulating; a waterproof seal securing said sole pad to a bottom portion of said upper, to thereby form a unitary article of footwear that contains said insole, an inner surface of said unitary article of footwear comprising said insole and said inner layer of material; and said three-layer upper being collapsible onto said insole, and said insole and sole pad being foldable.