If your feet are wearing the best socks ever made, why shouldn't your arms have the same opportunity swiftwick's sleeve is a 200-needle knit garment designed to mimic the swiftwick sock technology, with thin channels on the inside of the arm to allow for easy movement and flex in your elbow's bend yet durable enough to last more than a season. Swiftwick's signature four-inch compression cuff is included to provide enhanced support and padding to the wrist. Olefin, a hydrophobic fiber, gives added protection in the elements. No sliding, bunching, or falling down on your arms during your activities either. The same second-skin feel and wicking properties in our socks translates easily to our armwarmers, plus zero friction from the seamless vertical construction.