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4 hours 4 minutes 57 seconds

Therm-Ic has proven itself as a reliable choice when buying electrically heated insoles, socks and gloves. A popular choice for winter cycling, skiing, ice fishing, and for general use for people who have difficulty keeping their extremities warm.
This package comes with 1200 mAh S-Pack batteries, for a runtime up to 14 hours. The lower power settings are a bit “sneaky”: they use gentle warmth impulses to encourage your body to keep up circulation. The highest setting is hard to ignore, and helps you in the most extreme of conditions.
The socks are machine washable at 30ºC. Remember to detach the batteries before washing! Turn inside out, use gentle cycle, don’t use bleach or fabric softener.