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greenTEG CORE body temperature sensor
(Product No.: CR-A-166251)
greenTEG CORE body temperature sensor
With the CORE body temperature sensor from greenTEG, you add an underestimated component to your performance data, your body temperature. The chest sensor is so light that you don't feel it while it transmits information to you that allows you to perfectly control your fluid intake. This is particularly interesting during indoor training, as you overheat more quickly due to the lack of wind. So regulate your training intensity, active cooling and your drinking behavior in order to remain particularly efficient. Simply attach the temperature sensor to the chest strap of your heart rate monitor or use the included patches to position the CORE correctly.With the heat stress test you can determine your optimal stress temperature. On average, performance drops rapidly at a core body temperature of 38.5 °C. That's why professionals now increasingly rely on temperature measurements during training and competition. 19 of 23 professional teams in the 2021 Tour de France monitored their body temperature with the CORE. The CORE also contributed to road cycling victories at the Tokyo Olympics.
Technical data:
- Dimensions (LxWxH): - 8.35 mm x 40 mm x 50 mm
- Water permeability: - IPX7 (waterproof up to 1.5 m)
- Power supply: - Lithium-ion battery
- Operating time: - 6 days (with continuous data measurement), 6 weeks (in standby mode)
- Connectivity sensors: Bluetooth, ANT+
Compatibility:
Apps/Software:- iOS
- WatchOS
- Android
- Wear OS
- Garmin ConnectIQ
- Garmin training computer
- Garmin sports watches
- Wahoo training computer
CORE is also compatible with select third-party software and integration with additional devices and software continues.
Features:
- Temperature sensor for measuring core body temperature during exercise
- supports active cooling and the control of fluid supply
- Measurement via chest sensor
- Measurement accuracy +/- 0.21 °C
- Weight only 12 g
- Used by 19 of the 23 Tour de France teams in 2021
- 2 hours charging time
- 84 hours of data storage
Note: The CORE Body Temperature Sensor is not a medical device and therefore is not intended to diagnose or monitor any medical condition.
Scope of delivery:
- 1 x temperature sensor greenTEG CORE
- 1 x greenTEG USB charging cable
- 6 x plaster greenTEG CORE
Find more products here
CORE Size Chart
CORE Body Temperature / greenTEG does not use a traditional body size chart. The relevant sizing information is the physical size of the sensor and the fit of its wearing systems. The following overview is aligned with the CORE products currently listed at fit-und-warm.ch.
CORE 1 Body Temperature Sensor – Technical Size
| Product | Width | Height | Depth | Weight | Water protection |
|---|---|---|---|---|---|
| CORE 1 Sensor | 40 mm | 50 mm | 8.35 mm | 12 g | IPX7 / waterproof to 1.5 m |
Current FuW model: The 8.35 × 40 × 50 mm dimensions listed at fit-und-warm.ch correspond to the official CORE 1 sensor. The manufacturer now also offers CORE 2; that newer generation has different dimensions and should not be confused with the CORE 1 measurements.
Wearing Systems – Size and Fit
| Product | Size | Material / construction | Use |
|---|---|---|---|
| CORE Chest Strap | One Size / adjustable | Soft stretchable nylon | Wears the sensor on the chest; manufacturer-preferred position for precise sports measurements |
| CORE Arm Strap | One Size / adjustable | Elastic perforated material with hook-and-loop closure | Wears the sensor on the upper arm |
| Medical-grade adhesive patches | One size for CORE 1 | Adhesive patches | Alternative direct torso attachment |
| Securing clips | for CORE 1 | 2 clips per official replacement pack | Secures the sensor to a heart-rate or chest strap |
Arm strap note: The current official CORE arm strap is described as one-size-fits-all. The manufacturer also states that this arm strap is not recommended for CORE 2. It remains appropriate for the CORE 1 system currently listed at FuW.
CORE Team Bundle – Contents
| Component | Quantity | Size / capacity note |
|---|---|---|
| CORE Body Temperature Sensor | 6 | 40 × 50 × 8.35 mm / 12 g each |
| CORE Charging Station | 1 | for up to 6 sensors at the same time |
| CORE Chest Strap | 1 | One Size / adjustable |
| CORE Arm Strap | 1 | One Size / adjustable |
| CORE Body Plasters | 24 | for sensor attachment |
Charging Station and Charging Cable
| Product | Capacity / connection | Note |
|---|---|---|
| CORE Six-Bay Charging Station | up to 6 CORE devices | Stores and charges multiple sensors at the same time; LED charging indicators |
| CORE 1 Charging Cable | Magnetic device connection / USB-A | Designed for CORE 1; do not confuse with the magnetic USB-C cable used for CORE 2 |
CORE 1 – Additional Technical Specifications
| Feature | Specification |
|---|---|
| Battery life | up to 6 days continuous transmission / up to 6 weeks in sleep mode |
| Power supply | Rechargeable lithium-polymer battery |
| Connectivity | Bluetooth / ANT+ |
| Measurements | Core body temperature and skin temperature |
| Wearing position | On the torso, typically on a heart-rate strap or with adhesive patches |
Which Size Should You Choose?
- Sensor: CORE 1 has no size variants; all users use the same sensor unit.
- Chest strap: One Size and adjustable.
- Arm strap: One Size and adjustable.
- Team Bundle: suited to teams or groups that need to use and charge several sensors.
- Accessories: distinguish carefully between CORE 1 and CORE 2 because clips, cables and some wearing options are generation-specific.
Notice: The CORE 1 sports product currently listed at FuW is used for training and performance monitoring. The current FuW product page explicitly states that the CORE Body Temperature Sensor is not a medical device and is not intended to diagnose or monitor a medical condition. Seek medical advice for health concerns or unusual temperature readings.
Sources: official CORE / greenTEG product pages for CORE 1 Sensor, Chest Strap, Arm Strap, securing clips and charging cable; current CORE brand and product pages at fit-und-warm.ch. Status 08/2026.