Interesting device

Verified Buyer Reviewed by nightworker from portland, me on Saturday, January 3, 2009
First time use of these foot heaters. I used them in a pair of Keen Growler boots which already have primaloft insulation, but not enough for temps below 15F. My height is 65 inches and weight is 135lbs. During a six mile walk in minus 5 degree temperatures feet were quite warm almost hot for about an hour, then my feet became just warm for the remainder of the walk, so the product works, but I don't think they would keep the feet warm for five hours, and I still have to try them with uninsulated boots.
  • Best Uses: Cold Climate
  • Pros: Durable, Safe
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