A shoe comprising: an upper , the upper forming an interior portion for receiving a foot of a person, the interior portion including a toe cavity and a heel cavity ; a midsole , the midsole having (i) a toe end, (ii) a heel end, (iii) an inner side, and (iv) an outer side, wherein a perimeter of the midsole is stitched to the upper thereby forming a bottom to the interior portion that is bounded by a first seam ; a heel outsole patch stitched onto a heel portion of a first face of the midsole ; a toe outsole patch stitched onto a toe portion of the first face of the midsole; an insole that is affixed by glue to the bottom of the interior portion; characterized in that there is a spacing between (i) the heel outsole patch stitched onto the heel portion of the first face of the midsole and (ii) the toe outsole patch stitched onto the toe portion of the first face of the midsole, the spacing extending from the inner side to the outer side and occupying a position intermediate the toe end and the heel end thereby permitting the entire shoe to fold about an axis in the spacing running between the inner side and the outer side; and in that the shoe is configured to fold between (i) an extended state wherein the heel outsole patch and the toe outsole patch are coplanar or approximately coplanar and (ii) a folded state in which the shoe is bent about the axis such that a portion of the upper comprising the toe cavity is tucked into the heel cavity, and in that (i) a region of the shoe defined by the heel outsole patch and comprising a corresponding portion of the midsole and the insole has a spring constant of between 1.74 Newton (N) / cm and 2.12 N / cm ; and (ii) the toe outsole patch or the heel outsole patch has a durability coefficient of between 0.8 and 1.5. an upper , the upper forming an interior portion for receiving a foot of a person, the interior portion including a toe cavity and a heel cavity ; a midsole , the midsole having (i) a toe end, (ii) a heel end, (iii) an inner side, and (iv) an outer side, wherein a perimeter of the midsole is stitched to the upper thereby forming a bottom to the interior portion that is bounded by a first seam ; a heel outsole patch stitched onto a heel portion of a first face of the midsole ; a toe outsole patch stitched onto a toe portion of the first face of the midsole; an insole that is affixed by glue to the bottom of the interior portion; characterized in that there is a spacing between (i) the heel outsole patch stitched onto the heel portion of the first face of the midsole and (ii) the toe outsole patch stitched onto the toe portion of the first face of the midsole, the spacing extending from the inner side to the outer side and occupying a position intermediate the toe end and the heel end thereby permitting the entire shoe to fold about an axis in the spacing running between the inner side and the outer side; and in that the shoe is configured to fold between (i) an extended state wherein the heel outsole patch and the toe outsole patch are coplanar or approximately coplanar and (ii) a folded state in which the shoe is bent about the axis such that a portion of the upper comprising the toe cavity is tucked into the heel cavity, and in that (i) a region of the shoe defined by the heel outsole patch and comprising a corresponding portion of the midsole and the insole has a spring constant of between 1.74 Newton (N) / cm and 2.12 N / cm ; and (ii) the toe outsole patch or the heel outsole patch has a durability coefficient of between 0.8 and 1.5. (i) a region of the shoe defined by the heel outsole patch and comprising a corresponding portion of the midsole and the insole has a spring constant of between 1.74 Newton (N) / cm and 2.12 N / cm ; and (ii) the toe outsole patch or the heel outsole patch has a durability coefficient of between 0.8 and 1.5. <EOS>