ThermaCELL wireless remote control insoles for your shoes have two heat settings and a built-in thermostat. Comes with a wireless remote and charger. These rechargeable remotes fit in most boots and outdoor shoes. Plus they can be trimmed to size. Ranging in price from $130 to $180 they are good for 500 uses, which makes them more affordable than disposable heat packs in the long run.

ThermaCELL, www.heat.thermacells.com