Support stiff and sore muscles and joints while still allowing you to retain your range of motion We guarantee that at 88% Copper infused nylon our Copper Compression Gear sleeves are the highest concentration of copper infused fiber available today Especially for people suffering from arthritis, inflammation, or injury. But giving up, doing nothing, and sitting on the couch is NOT the answer. We believe that if you are buying copper-infused compression garments that you should get actual copper in your sleeves and at the highest copper content available. If you are not COMPLETELY satisfied for any reason at all, you can easily get a fast, prompt refund. So you get to try it out completely RISK FREE!