Heated Shoe Insoles

http://www.amazon.com/gp/product/B0009HMFPC/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

which did not work at all, even tried 14500 batteries & still no heat. They were noted on this thread:

I’m still searching for something reasonably priced that works…doing a construction project in the snow.