CORE is a Swiss sports technology brand developed from heat sensing work by greenTEG. Its small CORE 2 sensor is worn against the upper torso with an adhesive patch or chest strap. It estimates core body temperature continuously during training, racing and heat adaptation.

How it works
The sensor measures heat moving from the body toward the surrounding air, along with temperature at the skin. An algorithm uses this flow to estimate temperature deeper inside the body. Readings can appear in the CORE app or on compatible sports watches and cycling computers, alongside heart rate and training data.

Key considerations
The device estimates core temperature without entering the body, so correct placement and close skin contact matter. Readings can lag when temperature changes quickly. CORE is designed for sport and heat training and does not replace an internal clinical thermometer or medical assessment.