• Hold the device gently in your hand.
• Pull the trigger to activate the 3-minute cooling cycle.
• Stay Kühler. Perform Better.

You can use Kühler any time it is accessible. Optimal times for core body temperature cooling include pre-workout, mid-workout, and post-workout. Examples include at the gym in between sets, in-game breaks (dugout, sidelines, bench), or during extended cardio such as running. It can also be a helpful tool to reduce core temperature before bed or following exposure to hot environments.

Essentially, you can use Kühler anytime.

Kühler was designed to be lightweight, small, and truly portable. Without the need for water or ice, you can take and use Kühler anywhere. At home, at the game, at the arena, in the classroom, or in the woods on hike, anywhere you can go, Kühler can go too.

The glabrous skin of the body is extremely sensitive to temperature changes. To protect against excessive heat loss and hypothermia, blood vessels that travel to the palms and fingers are restricted at cold temperatures, a process referred to as vasoconstriction. Research has shown that water as cold as 21.5°C (70.7°F) can result in significantly decreased blood flow. Therefore, cold water or ice will result in the counterintuitive outcome of reduced blood flow to the glabrous skin, and therefore reduced core temperature cooling.

Kühler was designed to function optimally at room temperature, therefore preventing vasoconstriction while maximizing the rate of heat transfer using an aluminum surface with high thermal conductivity and a heatsink design for maximized convective cooling. With skin temperature typically ranging between 31-33°C (87.8-91.4°F), the temperature gradient is large enough for significant heat transfer.

For optimal results, we recommend having two devices, one for each hand. By increasing the duration and contact with the device, the total core body cooling capacity will increase, thereby improving the rate and volume of heat dissipation from the body. However, one device is sufficient for significant performance enhancements and recovery.

The Active Cooling features a thermoelectric cooler which, when a current runs through it, chills the spine of the device. This will help to create and maintain a higher temperature gradient between the device and your hand. The inside has a heatsink design and a cooling fan to dissipate the heat from the device into the environment. The entire housing is also made of aluminum and has heat sink fins inside, adding to the total surface area and cooling capacity.

The Active Cooling mode applies targeted thermoelectric cooling to the palm of the hand via the cooling plate. The Passive Cooling mode utilizes the cooling fan and heatsink design to cool the hands via convective heat transfer with the environment. Passive Cooling operates during the entire cooling cycle.

The temperature of the device can go as low as 50°F, although most operation of the device will typically be closer to 60°F, within the optimal temperature range. The surface temperature of the cold plate is regulated by the current provided, but the precise temperature will also be influenced by other variables. These include heat load applied (from the hands), the ambient environment temperature, and total run time (particularly if used with high volume). Therefore, there will be variability in the precise temperature.

When turning on the device, it will activate a 180 second cooling cycle. This includes a 60 second Active Cooling mode and 120 second Passive Cooling mode.

Total battery life will last up to 3 hours of use during cooling cycles and it is charged with a standard USB-C.

The vasodilation of the veins is primarily due to core temperature, with the arteriovenous anastomoses (AVAs) – the vasculature in the hand – being regulated by temperature. When your core temperature is elevated, vasodilation is the automatic response. Walloe (2015) has a great paper on this. As for the vacuum, the original Stanford research used a vacuum, but Kuennen (2010) found no difference between cooling with or without a vacuum. Also, the device operates in the optimal range temperature range identified (generally high 50s Fahrenheit) to prevent vasoconstriction from the cold.

We agree, it seems too good to be true… UNTIL you have tried it.

What is unique about Kühler is that it directly augments the root cause of physiological failure – elevated core temperature. All biological systems (including plants and animals) are regulated by temperature. Furthermore, all living organisms can be characterized by their ability to consume, convert, and utilize energy. Bounded by the laws of thermodynamics and entropy, excess heat released in all energy conversion processes are a consequence of life. Humans are no exception, and when exercising, excess heat production overwhelms the body and threatens the health of cells and physiological systems. Therefore, taking a 1^st principles perspective rooted in physics, thermal energy is arguably the most important variable in human health and performance.

By enhancing the thermal transfer rate and cooling the body, Kühler is DIRECTLY modifying the conditions that regulate all physiological activity, including endurance, power output, and recovery. Although we love alternative technologies such as massage guns, compression boots, and wearable devices, among various other tools, they are limited in their ability to immediately augment the conditions that are required for elite performance. If you want the best return on your investment, look no further than core temperature cooling. If you want to be the best, get Kühler.