Bringing the Heat

CORE is the first and only sensor for your core temperature that provides continuous and accurate readings.

CORE measures what really matters

Like an engine, your body loses about 80% of the energy it uses to heat. CORE measures and records your thermal vitals so you can safely and effectively optimize your body's thermo-regulation system.

Heat load
Heat stress describes the physiological processes that help 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 through an algorithmic combination of core and skin temperatures.
Heat zones
Your Heat Strain Index may fall into 1 of 4 Heat Zones. The Heat Training Zone (Zone 3) is the zone that causes physiological adaptations that improve performance. The time you spend in each zone is tracked in the CORE app.
Heat training load
Your Heat Training Load is the daily value (on a scale of 0-10) of time spent in the heat training zone (Zone 3). Optimal heat training consists of 2-3 sessions per week, with 45-60 minutes per session in the heat training zone.
Heat Adjustment Score
Under the right conditions, the human body has an impressive ability to adapt. The Heat Adaptation Score uses a research-based formula to calculate how well your body has adapted to heat, on a scale of 0-100%.
Core and Skin Temperature
The body's core temperature is the temperature near the internal organs in the trunk. Core temperature rises during physical activity, and if it becomes too high, it negatively affects performance. Skin temperature varies greatly depending on environmental conditions.

Train Hot
CORE allows you to safely apply heat acclimatization - a form of exercise that has been shown in controlled laboratory studies to increase hemoglobin mass, VO₂max, lactate threshold, power output and blood plasma volume.
Race Cool
Heat training makes your body more resistant to heat, allowing you to stay cooler and perform at a high level for longer - regardless of the temperature on race day. CORE also allows you to monitor your thermal readings in real time, so you can smartly adjust your pacing and cooling accordingly.

The numbers don't lie

↓ 26%
Less potential performance loss due to heat stress after training with CORE.
Source →
↑ 8%
Improvement in cyclists' time trial performance after only 10 days of heat training.
Source →
↑ 2.5%
Increase in hemoglobin mass after prolonged heat training in endurance athletes
Source →

What you don't measure, you can't improve.

SHOP CORE

Starting heat training from Core

1. Install the mobile app

Available for iOS and Android, the CORE App allows you to track and view your heat data, manage sensor settings and perform firmware updates.

2. Pair CORE with your favorite device

Connect the CORE sensor to your heart rate monitor, sports watch, cycling computer and training platforms for seamless integration.

3. Keep accurate records of your heat data

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