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Core body temperature sensor

With its CORE product, greenteg launched the first wearable for widespread use in sports. The sensor, which measures core body temperature, provides reliable real-time data to help athletes, sports teams, and coaches worldwide improve their performance in training and when competing.


CORE supports thermoregulation in athletes at exactly the level that enables maximum performance without the risk of overheating. Thermoregulation is also used in targeted heat training to continuously extend time to fatigue without risking injury.

This is made possible by the caleragt sensor technology, which greenteg developed in close collaboration with experts from science and medicine, and which has been successfully tested in more than 10 clinical studies.

In 2020, greenteg launched CORE as an independent international brand. Featuring integrated caleragt sensor technology, CORE now enjoys international renown and is used by athletes, sports teams, and coaches worldwide to optimally prepare for training and in competitions.


caleragt is a solution that monitors core body temperature and is designed for widespread use in wearables and medtech applications.

The caleragt solution is also available as a white-label product for use in the medtech, sport and occupational safety and health sectors.


  • Non-invasive sensor technology for the seamless measurement of core body temperature
  • AI-based algorithm enables precise calculation and analysis of the data measured
  • Comfortable to wear, water resistant, disinfectable
  • Compatible with mobile devices
  • Easy to control via the app
  • Storage, analysis and monitoring of data via a cloud solution
  • Certified Swiss sensor technology