When colder outside temperatures are detected, the nervous system restricts blood flow to the extremities to maintain the body’s core temperatures. The toes (and other extremities) quickly become uncomfortably cold.
By providing a base level temperature at the toes, Hotronic’s Heating Element blocks and neutralizes the penetrating cold keeping the blood circulation open while maintaining comfort and warmth in the feet.
Hotronic’s S Series Foot Warmers offer three (3) base level settings for comfort and warmth maintenance while Boost Setting 4 offers an extra blast of heat when needed.
Whether planning a brief outing or a long term journey, Hotronic’s Foot Warmer S4 is easy to use in all types of footwear. Use while skiing, snowboarding, bicycling, horseback riding, fishing, and during other coldtemperature activities.
HOTRONIC‘s S Series Foot Warmers are the culmination of years of experience in research, development, and testing. With enhanced reliability and longevity, the S Series Foot Warmers maintain their focus on ensuring one's comfort and warmth during the coldest of conditions!
Hotronic’s Foot Warmer S4 offers more than ever before. With enhanced reliability and longevity, the Foot Warmer S4 batteries maintain up to 55% of a full charge and 95% of their initial capacity after four years of non-use! Plus, an increase in capacity offers up to a combined 30% in higher average temperatures and longer durations on a single full charge, all when needed most, in the cold!!!
With four (4) batteries in each Battery Pack, the Foot Warmer Power Plus S4 is Hotronic’s longest lasting, most powerful Foot Warmer. At the same time, Hotronic’s NiMH batteries do not have a “memory effect” and do not require fully discharging before fully recharging. Hotronic’s S Series Recharger and Heating Elements come standard with each Foot Warmer S4.
By blocking and neutralizing the penetrating cold,
Hotronic’s Heating Element keeps
the blood circulation open
while maintaining
comfort and warmth in
the feet. The Heating
Element’s large oval
shape and selfadhesive
backing
provide effective
anatomical
coverage of the
toes and easily
installs in Hotronic’s
Heat Ready Insoles or
on insoles of one’s
own choice.
The Foot Warmer S4 offers three base level settings for comfort and warmth maintenance. A fourth setting offers an extra blast of heat when needed. Press-hold-and-release the Battery Pack’s ON or OFF button to select the desired setting. Easy to read LED lights indicate the setting selected and when the power is on or off.
Foot Warmer Power Plus S4 Temperature & Duration Chart |
|||
Setting |
Approximate Average Temperature |
Duration Range |
|
°F |
°C |
![]() |
|
1 |
84 - 98 |
29 - 37 |
16.5 - 21 h |
2 |
107 - 121 |
42 - 49 |
7 - 10.5 h |
3 |
122 - 138 |
50 - 59 |
5 - 7.5 h |
4 |
158 - 173 |
70 - 78 |
2.5 - 4.5 h |
Based on battery pack in ambient temperature of -22° to -15°C (-9° to +4°F) Based on heating element in ambient temperature of 20° to 26°C (68° to 79°F) Boost Setting 4 auto-resets to Setting 3 within 3 minutes. Total duration in chart is for information only. |
Wherever one goes worldwide, Hotronic’s advanced
global charging technology
senses when the
batteries are
charged and
protects them from
overcharging
damage by switching
to trickle current
recharging. Compatible
with all S, e, and m
Series Battery Packs,
the Recharger’s LEDs
indicate recharging mode and
battery charge status.