Abstract The shoe includes a sole and a layer of elastic material positioned to stretch and create tension that enhances securement of a foot inserted into the shoe. A polymer heel cup is coupled to the sole and upper and has an S-wave in a vertical cross-section of a rearmost portion. The heel cup has diagonal beams separated by apertures, and the diagonal beams include beams of at least two different widths. A compressible interior foam layer is near a forward-facing surface of the upper portion of the heel cup and extends into the shoe opening, providing securement of the foot once inserted.
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