Not sure about 6+ hours

Verified Buyer Reviewed by Jim from Cape Cod, MA on Tuesday, February 16, 2010
I used these while skiing in zero degree whether recently. I felt that my toes were warm from the morning through lunchtime, but by early afternoon, I felt that the heat pads were exhausted. Maybe I got 4-5 hours out of them, but certainly not 6-7. Exposure to air drives the heat generating chemical reaction so be sure to leave them out for several minutes before putting them in your boots. I was in a hurry and didn't do this, so maybe this made the difference.
Previous Review “Worked great”
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