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Compatible with all Hotronic insoles and heating elements, the Hotronic FootWarmer S4+ Power Set Boot Heaters fight the freeze with four powerful heat settings. No more need to hunker down in the lodge massaging the feeling back in your toes, just seriously toasty turns all day long.
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 and 1 Recharger