CORE 2 Thermal Sensor represents the next generation of non-invasive core temperature monitoring. It is 48% smaller and 30% lighter than the original CORE 1, making it comfortable to wear in training and racing. Delivering precise, real time core temperature data, CORE 2 helps athletes understand heat strain, optimise pacing, and adapt training for better performance outcomes. Trusted by Olympic champions, ultrarunners, and elite coaches, it supports improvements in VO2 max, haemoglobin mass, and lactate threshold.

Paired with the COROS Heart Rate Monitor, this bundle delivers reliable cardiovascular data without the discomfort of a chest strap. Worn comfortably on the arm, the COROS HRM uses a high-accuracy multi-channel optical sensor to provide consistent heart rate readings across all conditions. With up to 38 hours of continuous use and the ability to connect to three Bluetooth devices at once, it fits seamlessly into any training setup.

Together, CORE 2 and COROS HRM give you deeper insight into effort, intensity, and thermal load. Whether you are training for endurance events, pushing intervals, or managing heat in long sessions, this bundle helps you make informed decisions that lead to better performance and recovery.

CORE 2 measures your core body temperature using advanced, non-invasive sensor technology. By tracking changes in core temperature in real time, it provides insight into how heat stress affects your performance. This allows you to adjust pacing, intensity, and cooling strategies to maintain optimal performance and reduce the risk of heat-related fatigue.

The COROS Heart Rate Monitor complements this by tracking cardiovascular effort through a high-accuracy optical sensor worn on the arm. It delivers consistent heart rate data across a wide range of activities and conditions, syncing easily with watches, apps, and training platforms. Together, these devices give a clearer, more actionable understanding of how hard you are working and how your body is coping.