Foot Warmer S4+ Custom

You need the Hotronic FootWarmer S4+ Custom Boot Heater in your life. It's easy to install on any insole and comes complete with four distinct temperature settings to keep your piglets as cozy as can be. The "Custom" model does not come with insoles. Intended for installation on custom insoles you already own. Compatibility For use in Hotronic‘s Heat Ready Insoles, custom insoles, orthotics, or insoles of one‘s own choice. 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.

• Four different heat settings for up to 21 hours of heated feet.
• The Custom S4+ will install in al types of footwear and can be easily transferred between footwear.
• For use while skiing, snowboarding, and other cold-temperature activities.
• Footbed required to use these heaters (either stock or custom).
• Redesigned power switch to minimize unintended outages.