Hotronic FootWarmer S4+ Power Set Boot Heaters

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