To use the ThermoNet Headband, simply put it on your head like a regular headband. It's designed to fit well with helmets, so you can wear it comfortably under your helmet during cold-weather activities. When you're done using it, you can hand wash it in cool water with a mild detergent. Don't wring it out too hard; just gently squeeze out the excess water. Then, lay it flat to dry. Avoid exposing it to direct sunlight for a long time as it might damage the fibers. Also, make sure to check the headband regularly for any signs of wear and tear. If you notice any loose seams or other issues, it's best to get it repaired or replaced to keep it working well.