CORE 2 Thermal Sensor

CORE 2 Thermal Sensor – Real-Time Core Body Temperature Monitor for Smarter Training

Unlock a new level of endurance performance with the CORE 2 Thermal Sensor. Designed for cyclists, runners, triathletes and endurance athletes, the CORE 2 provides continuous, non-invasive core body temperature monitoring to help optimise pacing, hydration, heat training and race-day performance.

Compatible with Garmin, Wahoo, COROS, Polar, Apple Watch and other Bluetooth® and ANT+ devices, the CORE 2 delivers accurate thermal data directly to your favourite training platform. Whether you're preparing for a summer sportive, an ultra-distance event or a high-performance race, CORE 2 helps you train smarter and perform better in hot conditions. 

Key Features

• Continuous core body temperature monitoring

• Research-backed, non-invasive thermal sensing technology

• Optimise heat training for improved endurance performance

• Monitor Heat Strain Index in real time

• Supports pacing, hydration and cooling strategies

• Bluetooth® Low Energy and ANT+ connectivity

• Compatible with Garmin, Wahoo, COROS, Polar and more

• 48% smaller and 30% lighter than the previous generation

• Up to 6 days of battery life with extended standby mode

• IPX7 water-resistant design for all-weather training

Train Smarter in the Heat

Heat is one of the biggest factors affecting endurance performance. The CORE 2 Thermal Sensor provides live insights into your body's thermal load, allowing you to manage effort, cooling and hydration before overheating impacts performance. It also supports structured heat adaptation protocols that can improve physiological responses such as plasma volume, haemoglobin mass and endurance capacity. 

Lightweight, Comfortable & Easy to Use

Weighing just over 11 grams with the clip attached, the CORE 2 is significantly smaller and lighter than its predecessor. It securely attaches to a compatible heart rate strap or armband and automatically syncs with supported devices, giving you live data without interrupting your ride or run. (Cycle Store Zurich)

Perfect for Cyclists, Runners & Triathletes

Whether you're climbing alpine passes, racing gravel events, training for an Ironman or preparing for a marathon, the CORE 2 helps you understand how heat affects your performance. With actionable thermal data, you can make informed decisions on pacing, hydration and cooling to maximise efficiency throughout every session.

Why Choose the CORE 2 Thermal Sensor?

The CORE 2 is trusted by elite endurance athletes and coaches worldwide because it provides the missing performance metric: core body temperature. If you're serious about improving performance in challenging conditions, this compact sensor gives you the data needed to train more effectively, race smarter and recover better.