Control body temperature and you'll control fatigue. Palm Cooling gives you that control.

AVA Cooling's Anti-Fatigue Charge Bar is the key to enhancing performance, accelerating recovery, and boosting your overall wellness.

Tap into your physiology: Leveraging the power of your arteriovenous anastomosis (AVA) system underneath the glabrous skin of your hands, feet, and face, we're delivering the ability to effectively, efficiently control your body temperature like never before.

  • Increase Training Volume

    Improve Performance While Working Out / Training

  • Optimize Rest Breaks

    Delay The Onset of Fatigue When Playing Sports

  • Fall Asleep With More Ease

    After a Late Game or Workout, Decrease Arousal & Temperature

3 colorways of the new palmar cooling device from AVA Cooling Technology

Exercise leads to increased muscle and core temperature which causes muscle fatigue and loss of motivation.

Control body temperature and you'll control fatigue. Enhance muscle function and maintain motivation with AVA Cooling Technology's AF Charge Bar. Capitalize on the built-in heat exchange zones in your hands, feet and face.

Trusted By Athletes At The Elite Level

  • Exercise or Compete

  • Palm Cool In-Between Sets or Exercise

  • Exercise or Compete

  • Palm Cool In-Between Sets or Exercise

  • Claus Souza, NBA Strength Coach

    "I just performed a lifetime PR on the deadlift of 520 pounds at age 43. The only difference in my training this year is the addition of palmar cooling."

  • Tommy Otley, team physical therapist for U of Miami Basketball

    "Palmar cooling is an evidence supported way to take advantage of our body's natural cooling system and optimize heat offloading through arteriovenous anastomoses. The AVA Charge Bar has been a valuable addition to help us better utilize this system to maximize rest periods during practices and games. Our athletes come looking for it as soon as they come out for a substitution or at timeouts and feel like it's been a great way to stay fresh thoughhout competition."

  • Ryan Peterson, PT and Strength Coach

    "While most fitness products are marketed as short cuts that promise greater results with LESS work, temperature regulation during training literally helps you do MORE work in a training session. Since it helps you recover better between sets/bouts/intervals, the added work is also of higher quality. It is a no-brainer for me to include this in performance training with all levels of my clients."

  • Karen de Saint Phalle, former D1 Runner

    "I have been training with my strength coach weekly for almost 3 years. Since he introduced AVA Cooling to my training, the workouts are now manageable. I am able to finish our typical 8 sets and even increase the load as I do. While I don’t know all the science behind AVA Cooling, what I have directly experienced is a quick full-body and mental release from the “distressed” state the heavy lifting puts me in. My body and mind quickly pop back into a “let’s go” state to complete the killer workouts he prepares for me.

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How long do you need to hold onto the device to get a performance enhancing effect?

We recommend using the palm cooling device anytime you will have at least 20-30 seconds of rest before you start your next rep, set, interval or effort. In the initial research a 3 minute rest break between sets to failure was often used. These studies showed significant improvements in performance. In our internal testing at AVA Cooling Tech using our device we are seeing 15-20% improvements in work volume when using 3 minute rest intervals. However, we are actually seeing 28-30% improvements when using shorter rest intervals of 60-90 seconds between efforts. When training our clients, we use the palm cooling device between sets or intervals anytime we have at least 20-30 seconds of rest before the next effort. During sporting events we recommend using the palm cooling device as much as possible during the event.

If I cool my AF Charge Bar (palm cooling device) in a refrigerator should it have water in it?

Yes! Always use your palm cooling device with water inside. The cool water in your device will allow it to stay cool for the greatest amount of time possible. The metal bar and the water work together to resist the change in temperature that the heat of your palm is dumping on to it. So, when you cool your device in the fridge, fill it with water first. Otherwise, you can just cool it by filling it with cool water. Remember, the ideal temperature for improving performance is between 45 and 60 degrees Fahrenheit (7.2 - 15.5 degrees Celsius)

Why should I buy your device instead of others on the market?

There are a few specific advantages that our patent pending, palm cooling device provides. 

-Our device has a built in thermometer that lets you know the exact temperature you are cooling at.

-Our device is practical for use indoors or outside and anywhere you are training, practicing or competing. It’s simple design is both durable, packable and transportable. It can go anywhere you go and does not require any batteries, wires, tubes, gloves or mitts. 

-Our device allows for both hands to be cooled with one device! This is so important because you want to maximize how much surface area you are cooling. Other devices are only large enough to cool one hand and/or only cool a part of that hand.  This means you would need to buy multiple units of the competitor to do what one of our Anti-Fatigue Charge Bars does.

-Our device can be re-cooled at a sink or fountain so you are not dependent on having a refrigerator. The ideal temperature of a palm cooling device is between 45 and 60 degrees Fahrenheit. Most water fountains and cold settings of tap water are set between 40 and 50 degrees so if you fill your device from a fountain it will be the perfect starting temperature. The other cooling devices on the market depend on being cooled externally by some type of refrigeration. Our device can be cooled internally by filling it with cool water. This is very important as no cooling device will hold it’s temperature forever. Our tool will stay in the 45-60 degree range for 45-60 minutes when used intermittently during a typical workout. If you feel the device getting too warm you can just refill it with cool water. The competing devices would need to be put back in a refrigerator to be recooled which is not practical to do during a workout or competition. 

-Our device is affordable! For less than a typical pair of running shoes, the Anti-Fatigue Charge Bar can be yours. Just think of the money spent on supplements, vibration guns, compression tights and the like in HOPES that they will provide the smallest amount of benefit.

Meanwhile, palm cooling is SHOWN in peer reviewed research to provide benefits of 15-60% in terms of improved performance. The return on investment for palm cooling is incredible. 

Do you ship internationally?

Yes! We have shipped our palm cooling device all over the world. Simply go through the purchasing sequence in our store and when you enter your address you will see the shipping costs. If you are ordering 3 or more devices please contact us for a custom shipping quote.

*We do not pay any international import fees or taxes. These are the responsitbity of you the customer. Please track your package to be aware of when it arrives in the hands of cutoms so you can claim your package.

How Palm Cooling Works

  • Cool Both Hands With One Device

  • Practical for Use in Gyms and Sports

  • Recharge at Faucet or Fountain

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  • Improvements in Repetitions per Set

    Research is showing incredible improvements in training volume when using cooling methods between sets. For instance, when performing max reps of an exercise during consecutive sets, those who use cooling techniques between sets are able to keep their reps per set 40-60% higher than those who simply rest for the same amount of time without cooling.

  • Cooling is Key

    Cooling specific areas, not icing, is the key. If the temperature of your cooling device is too cold your body will constrict the blood vessels (AVAs) and the system will be much less effective. This is the problem with other cryotherapies that target non-glabrous skin (hairy skin) and use temperatures that are too cold.

  • Advantage in Breaks in the Action

    During competition there are breaks in the action such as time outs and half times. These breaks allow for physical and mental recovery. But are these breaks being maximized in terms of recovery science? The simple answer is, no. Cooling through the hands, feet and face can allow the athlete to assist thermoregulation, delaying fatigue, maintaining motivation and thereby improving performance.

  • Performance Enhancement

    Supported by Clinical Research, Improvements in output from Palm Cooling devices, like AVA Cooling Technology, range from 15-60%

  • Restful Nights

    When you are hot at night, what's the first thing you do? You stick your foot out from under the blanket. Why? You are taking advantage of the AVAs in the bottom of your foot to cool you down.

  • Maximizing Rest Breaks

    Rethink recovery by maximizing rest breaks. Sports medicine professionals and athletes are taking advantage of palm cooling to delay fatigue.


The practical application of palmar cooling.