Zephyr of Annapolis makes gear that people wear so that their vital signs can be monitored remotely.
One of their products, the BioHarness, has been worn by the trapped Chilean miners to monitor their heart rate, breathing and other vital signs for the past couple weeks.
Zephyr's products have applications in first responder scenarios, defense and military, and research and training. Below is a photo of the BioHarness worn by the Chilean miners: