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Heated Insoles Instructions – How to Keep Feet Warm in Winter

It’s easy to learn how to keep feet warm in winter with ThermaCELL Heated Insoles instructions. See the video or written instructions below or download a PDF.

Video: It's Easy to Use ThermaCELL Heated Insoles

Watch how to keep your feet warm in cold weather using ThermaCELL Heated Insoles. See for yourself in this video.

Learn how to warm feet with ThermaCELL Heated Insoles. Follow these easy directions.

» Download ThermaCELL Heated Insoles Instructions (2.25 MB | PDF)

You can trim insoles to fit boots or shoes if needed.


  • Be sure to follow the warning statement printed on the bottom of the insoles that indicate where not to cut.
  • The two cutting lines are for reference only.
  • Do not cut beyond the solid line, or excessively bend the insoles. This could cause damage to the heating elements and the product.

When sizing Heated Insoles, be sure to consider the thickness of the socks you will use with your footwear. Your socks are also an important part of how to keep feet warm in winter.

Tip:  If your shoes or boots have a removeable insole, you can take that out and use it as a tracing tool to ensure your ThermaCELL Heated Insoles are the correct size.

ThermaCELL Heated Insoles must be fully charged before the first use.  It may take up to 4 hours for a complete charge. 

The lithium-ion polymer batteries embedded in the insoles can be recharged well over 500 times for many years of use.   The batteries are embedded in the insole material and cannot be accessed.

Follow these steps to charge the batteries:

1) Set the on/off switch at the heel of each insole to the off (left) position.
2) Plug the Heated Insoles Global Charger into an electrical outlet.  The LED on the inline (triangle) connector will not yet turn on.
3) Plug the Heated Insoles Global Charger cables into each insole’s recharge port. These are located at the heel of each insole. Once the connections are established, the charger LED on the inline (triangle) connector will glow green indicating that the charging process has started.
4) Charge the insoles until the LED light on the inline connector turns off, indicating that the insoles are fully charged.
5) Unplug the global charger and remove the cables from each insole. Your ThermaCELL Heated Insoles are now ready for use.

You can charge one or both insoles at the same time.  If either Insole needs to be charged, the LED light on the inline connector will glow green when plugged into both the wall and the Insole. When the insoles are fully charged, the green LED on the inline connector will turn off.

For best performance, occasionally completely drain the batteries of both insoles before recharging. To do this, turn the insoles on using the on/off switch at the heel of the insole. Use the remote control to set the insoles to the high setting. Let the insoles heat on high until the LED lights on the insoles turn off.

The first time that you use your ThermaCELL Heated Insoles, you will have to remove the clear plastic tab from the Remote Control to activate the already installed battery.

1. Turn each Heated Insole on by moving the ON/OFF switch at the back of each Insole to the right (ON) position. The red LED light at the back of each Insole will flash intermittently and Insoles will default to the No Heat setting. Note: If no specific heat setting is selected, the Insoles do not generate heat and use minimal battery power.
2. Select a setting on the Remote by using the buttons indicating: High, Medium or No Heat. The LEDs on the back of each insole will flash in different patterns depending on the heat level selected. On No Heat they will flash one time every several seconds, on Medium they will flash two times every several seconds, and on High they will flash three times every several seconds.
3. Insert the Insoles into shoes or boots by following the directions located at the bottom of the Insoles. Trim Insoles to fit if needed. Insert into shoes with the black side facing down (red side up).
4. Use the Remote Control to operate the Insoles while shoes or boots are on feet. The LED light on the remote will flash once to confirm a heat setting has been transmitted to the Insole.  The remote can be used up to 7 feet from Insoles.

Note: The heating element in each Insole extends from the toe area to the ball of the feet. The arch and heel areas are not heated.

  • Heated Insoles do not get “hot” to the touch, and will not get as hot as disposable/chemical warming pads.  They are engineered to keep your feet warm, to avoid sweating and freezing.  They maintain a steady temperature of 100° or 111° inside your boots or shoes (depending on the heat setting chosen), keeping your feet around normal body temperature.
  • For best results, use Heated Insoles in a cold environment.  You are less likely to feel the heat output in a warm environment.
  • For a better fit, remove the insoles currently in your footwear (if removable), and replace with Heated Insoles. Make sure footwear is not too tight; tightness naturally causes feet to get cold.
  • The tabs at the end of the Heated Insoles will assist in easy removal of the Insoles from shoes or boots after use. Be sure to insert Insoles with the tab sticking up.
  • Once Heated Insoles have been fully charged, they will operate for up to 5 hours on Medium.  The outside temperature and quality/insulation of footwear will affect run time. 
  • To prolong battery life, it is recommended that the Insoles be in the No Heat setting when the user is engaged in strenuous activities. At high exertion levels, the body typically generates enough heat to keep the feet warm.
  • Maintaining a comfortable heat level while using Heated Insoles depends upon proper installation and activation of the Insoles, along with the type, fit, insulation, and dryness of the footwear and/or socks being worn.
  • For best performance, it is recommended to wear well insulated boots and medium-to-lightweight socks that wick away moisture and keep feet dry. A very heavy sock will prevent heat from reaching your foot.
  • For best results, turn Heated Insoles on at the first sign of your feet getting cold.

There are two ways to turn off ThermaCELL Heated Insoles:

1) Long-Term: When you are not using your Insoles for a prolonged period of time (many hours or days), remove the Insoles from your shoes and turn the ON/OFF Switch at the back of each Insole to the left (OFF) position. The Remote Control will turn off automatically.

2) Short-Term: When you are not using your Insoles for a short period of time (up to a few hours or when your feet are warm), use the Remote Control's “No Heat” setting to put the Insoles into “standby” or “sleep” mode. This will exhaust the battery at approximately 2% per hour. When heat is needed, simply press the High or Medium button on the Remote Control to reactivate heat.

    • Turn off ThermaCELL Heated Insoles when not in use.
    • Store the Insoles and Global Charger in a clean and dry place. Charge the Insoles fully before long-term storage.  Recharge the Insoles every few months to maintain peak performance.
    • Only use ThermaCELL chargers to charge the Insoles.
    • Only charge the Insoles when they are outside of shoes or boots.
    • Do not damage the heating elements by excessively bending the Insoles.
    • Cut the Insoles to size only as indicted in instructions and on Insole.
    • Clean with a damp cloth only. Do not use chemicals or cleaning agents.
    • Do not submerge in water. Insoles are water resistant, not waterproof. If Insoles become submerged in water, air dry before attempting to use.
    • Only air-dry the Insoles. Do not place them on radiators or any other hot surface.
    • Let the Insoles dry completely before charging again.
    • The switch on the Heated Insoles must be set to the left (OFF) position when charging.
    • See the FAQ for more helpful information.

    The Heated Insoles Remote Control comes equipped with one lithium cell #CR2032. The battery should last up to 2 years with normal useage. But to ensure uninterrupted service from the remote, replace the battery each year.

    Follow these steps to replace the battery:

    1. Remove the 4 small Phillips screws on the underside of the remote control.
    2. Lay both sides of the remote control open on a table. Remove the green printed circuit board and turn the board over so the battery holder is face up. Using a coin, push the battery out from under the battery holder.
    3. Insert the new battery into the holder, making certain that the positive (+) side of the battery is face up.
    4. Return the green circuit board to its original position, making sure the battery is on the underside of the printed circuit board. Put the housing front (with the black rubber spacer piece) over the circuit board.
    5. With the two sides of the remote control together, secure the two side panels by replacing the 4 small Phillips screws.

    The insoles and remote control contain batteries. Batteries must be disposed of in accordance with local laws and regulations.

    • Use ThermaCELL Heated Insoles according to instructions.
    • Be aware of early sensations of a burn:
      • An area of a foot becomes hot
      • Any area of a foot feels as if you are standing on a small pebble or pointed object, and may or may not feel hot
    • If you feel the early warning signs of a foot burn, immediately discontinue the use of the Heated Insoles.
    • If you think you have a burn, see a physician immediately.

    If the Remote Control does not properly activate the Insoles per the instructions, you will need to re-key the Remote Control to the Insoles. The Heated Insoles and the Remote Control are keyed at the factory so that your Remote Control will only operate your Insoles. Please follow the directions below ONLY if you need to re-key Heated Insoles with a Remote Control:

    1. Each Insole must be “paired” with your Remote and is easiest to do one Insole at a time.
    2. Turn the Insole switch on the back of each Insole to the right (ON) position. Insert and remove the charging cable twice (2 times) very quickly into the Recharge Port located at the back of the Insole. Note: to ease the process, insert charger into Recharge Port until Insole LED illuminates, you don't have to “click” it in.
    3. The Insole LED will start flashing a sequence of one (1) long flash followed by four (4) very short flashes to indicate the “pairing” mode is in process. The flash sequence will repeat three (3) times and then will time out. During this process, press any button located on the Remote (if you do not press a button in time, simply repeat the process from Step 2). This will re-key the Insoles with the Remote Control.
    4. Repeat Steps 2-3 with the other Insole.
    5. This completes the re-keying of your Heated Insoles.

    ThermaCELL Heated Insoles have been tested and comply with the limits for a Class B digital device. The limits are designed to provide reasonable protection against harmful interference in a residential installation. ThermaCELL Heated Insoles equipment generates, uses, and can radiate radio frequency energy. If not installed and used according to the instructions, it may cause harmful interference to radio communications. There is no guarantee that this type of interference will not occur in a particular installation.

    To determine whether this equipment is causing harmful interference to radio or television reception, turn ThermaCELL heated insoles off and on.

    If this equipment does cause harmful interference to radio or television reception, try one or more of the following measures to correct the problem:

    • Relocate or change the position of the receiving antenna
    • Increase the space between the Heated Insoles equipment and the television or radio
    • Connect the Heated Insoles equipment into an outlet on a different circuit than the one to which the radio or television is connected
    • Consult an experienced radio/television technician for help

    Heated Insoles comply with Part 15 of the FCC Rules and with Industry Canada license-exempt RSS standards. Operation of Heated Insoles is subject to the following two conditions:

    1. Heated Insoles equipment may not cause harmful interference.
    2. The Heated Insoles device must accept any interference received, including interference that may cause undesired operation.

    Modifications not expressly approved by The Schawbel Corporation can void your authority to operate this equipment under Federal Communications Commission rules.

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