IFJ_issue1_2023_smarttextiles_prevayl2 Ken Norberg February 23, 2023 0 Views Prevayl’s sensor is one of the lightest fitness tracking devices in its class, and tracks heart rate, breathing rate, body temperature and body movement. Photo courtesy Prevayl Prevayl’s sensor is one of the lightest fitness tracking devices in its class, and tracks heart rate, breathing rate, body temperature and body movement. Photo courtesy Prevayl