The Hotronic Power Plus m4 Custom FootWarmer is Hotronic's most powerful, longest-lasting foot warmer! This foot warmer has four (4) cells in each battery pack.
This foot warmer installs in all types of footwear and transfers easily from one pair of footwear to another. Use while skiing, snowboarding, bicycling, horseback riding, fishing and during other general cold-temperature activities.
For the overseas traveler, the m4 uses advanced global charging technology with overcharge protection and input range of 100V-240V. The m3/m4 Power Plus recharger includes both North American and European plug adapters and is compatible with the m3 and m4 battery packs.
Install in any of Hotronic's Heat Ready Insoles (semi-custom heat-ready insoles or one-size-fits-all heat-ready insoles) or on insoles of your own choice.
Want the get a custom fit in your boot without paying custom-fit fees? Looking to make your Hotronic installation much easier? Click here for Hotronic's Semi-Custom insole. It's an excellent addition to your M4 Kit!