A flexible shoe sole that can produce both hot and cold temperatures for the feet is seen durin …

A flexible shoe sole that can produce both hot and cold temperatures for the feet is seen durin ...

A flexible shoe sole that can produce both hot and cold temperatures for the feet is seen during CES Unveiled at the Mandalay Bay Convention Center on Sunday, Jan. 7, 2024, in Las Vegas. (Madeline Carter/Las Vegas Review-Journal)