| CPC A43B 3/44 (2022.01) [A43B 3/34 (2022.01); A43B 13/12 (2013.01); G01B 11/14 (2013.01); G01B 11/16 (2013.01); G01L 1/24 (2013.01); A43B 3/48 (2022.01); G01L 5/166 (2013.01)] | 17 Claims |

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1. A shoe, comprising:
a sock liner assembly configured to receive a reflectant panel; and
a midsole assembly configured to receive an optical sensor,
wherein the optical sensor comprises an optical source configured to emit a beam directed to the reflectant panel and an optical detector configured to detect a portion of the beam reflected by the reflectant panel,
wherein the optical sensor is configured to measure a relative displacement between the sock liner assembly and the midsole assembly based on a change of the detected portion of the beam caused by the relative displacement,
wherein the sock liner assembly comprises a first sock liner portion and a second sock liner portion that is more rigid than the first sock liner portion, wherein the reflectant panel is disposed on the second sock liner portion.
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