Picture of the OURA ring (IMAGE) University of California - San Diego Caption The researchers used the ŌURA ring, a smart wearable produced by Finland-based company Oura Ring to track skin temperature in the study. Credit OURA Ring Usage Restrictions Please credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.