Hotronic FootWarmer S4+ Custom Boot Heater

Powerful Longevity – S-Series NiMH batteries maintain up to 55% of a full charge and 95% of their initial capacity after four years of non-use. An increase in capacity offers up to 30% higher temperature and longer duration on a single full charge when needed most - in the cold.

4 Distinct Temperature Settings – The S4 offers three base level settings for comfort and warmth maintenance, with a fourth setting for a blast of extra heat when needed.

Includes 2 Battery Packs, 1 Recharger, and 1 pair of Heating Elements with Cambrelle® Covers

Compatibility – For use in Hotronic‘s Heat Ready Insoles, custom insoles, orthotics, or insoles of one‘s own choice.

Simple Installation With Household Tools

Attaches to the Power Straps of Ski Boots