Not Just Skin Deep

CORE is the first and only core body temperature sensor that delivers continuous, accurate monitoring without invasive 
e-pills or probes.

How CORE Works

INNOVATIVE THERMAL ENERGY TRANSFER SENSOR

Other types of wearable thermometers just record skin temperature, the CORE sensor incorporates a Swiss-made thermal energy transfer sensor that detects heat moving from or into the body.

POWERFUL AI ALGORITHM

Input from the thermal energy transfer sensor is processed by an onboard algorithm built from over one billion data points. This machine learning power means the sensor can be continually optimized.

REAL-TIME DATA TRANSMISSION

Like other sports sensors, the CORE 
sensor transmits data to paired devices automatically. Just keep it charged, shake it before an activity, and check for the flashing green light.

What Does CORE Show You?

CORE measures and records five important metrics. They are summarized in the CORE mobile app and some can be displayed live on your connected 3rd-party device.

Core Body Temperature

Core body temperature is the temperature near internal organs in the torso. Core temp rises when we exercise, and if it rises too high, performance suffers. The CORE sensor continuously records your core temp. 

Skin Temperature

Skin temperature varies widely depending on environmental conditions. While skin temperature helps your body regulate core temperature, there is often little correlation between the two. It’s possible for your skin to be cool (and you will feel cold) while your core temperature is quite elevated. The CORE sensor continuously records your skin temperature.

Heat Strain

Heat strain describes the physiological processes that cool the body. The harder the body works to cool itself, the greater the strain, and the greater the impact on performance. CORE’s Heat Strain Index (HSI) quantifies this strain in real time using an algorithmic combination of core and skin temperatures.

Heat Zones

Your Heat Strain Index can fall into 1 of 4 Heat Zones. The heat training zone (Zone 3) is the one that causes physiological adaptations that improve performance. Time spent in each zone is tracked on the CORE app.

Core Body Temperature

Core body temperature is the temperature near internal organs in the torso. Core temp rises when we exercise, and if it rises too high, performance suffers. The CORE sensor continuously records your core temp. 

Skin Temperature

Skin temperature varies widely depending on environmental conditions. While skin temperature helps your body regulate core temperature, there is often little correlation between the two. It’s possible for your skin to be cool (and you will feel cold) while your core temperature is quite elevated. The CORE sensor continuously records your skin temperature.

Heat Strain

Heat strain describes the physiological processes that cool the body. The harder the body works to cool itself, the greater the strain, and the greater the impact on performance. CORE’s Heat Strain Index (HSI) quantifies this strain in real time using an algorithmic combination of core and skin temperatures.

Heat Zones

Your Heat Strain Index can fall into 1 of 4 Heat Zones. The heat training zone (Zone 3) is the one that causes physiological adaptations that improve performance. Time spent in each zone is tracked on the CORE app.

How to Use the Data

How to Use the Data

TRAIN HOT

While heat training or adapting for a hot race, monitor core temperature in real-time to stay in your heat training zone. This way you’ll adapt without overheating yourself. Track your weekly and monthly thermal load to ensure you maintain your adaptations.


RACE COOL

While racing (and exercising in the heat), track your core temperature and Heat Strain Index. Keep them below thresholds that cause performance loss by taking proactive cooling measures.

Getting Started

Available on iOS and Android, the CORE App lets you track and review your heat data, manage the sensor’s settings, and complete firmware updates.

Pair the CORE sensor with your HR monitor, sports watch, bike computer, and training platforms for seamless integration.

Review your heat data in the CORE app, track your heat acclimatization progress, and develop heat awareness to stay cool and perform your best on race day.

Integrate your heat data into training software like TrainingPeaks and Golden Cheetah so you and your coach get get a more informed picture of your performance.

Accuracy and Validation

Accuracy and Validation

We take a rigorously scientific approach to accuracy and validation. Learn about our extensive internal and external testing.

LEARN MORE

Train Hot, Race Cool

SHOP CORE