A friend of mine just passed along this info to me, so I thought I would do the same. Very interesting.

This information was also included:
""Unlike typical heated insoles that require clunky external battery packs and wires, these cordless insoles have embedded rechargeable batteries that deliver enough heat to keep feet at a comfortable 98. degrees F. for up to 8 hours of skiing, sledding, or snowshoeing. The wafer-thin lithium -ion cells are virtually undetectable and can be recharged up to 500 times with no creation of battery "Memory", ensuring a consistently lengthy operation with each use. ( requires eight-hour charge from included AC. recharging adapter.) The insole's six-layer design includes a shock-absorbing, ergonomic polyurethane base, while a layer of heat retaining synthetic material staves off frigid temperatures. Carrying pouch holds insoles, and lightweight recharging adapter. Plugs into AC. $100 a pair.


http://www.hammacher.com/publish/75945.asp