It is quite common for Koreans to use hot stones for warming themselves during harsh winters. Keeping this in mind, we have here the ST-ON concept, which is a stone warming unit for mountain climbers. When the stone-shaped units are fully charged and warm, they turn orange and start radiating heat when removed from the charging unit. They keep you warm during your mountain climb, but I reckon anyone with cold feet can use this.
Designers: Sooeon Kim and Sangyong Park
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(Stones of Warmth was originally posted on Yanko Design)
See original here: Stones of Warmth
via hugocalmeida http://hugocalmeida.com/2012/08/28/stones-of-warmth-2/