MAXIMUM SWEAT AND MOISTURE MANAGEMENT - Our signature Olefin fiber is a light-weight, high-performance fiber that wicks moisture and dries quickly, so your feet stay dry and blister-free wherever your adventures take you. THIN, BREATHABLE DESIGN - Upper channels and a mesh footbed are thinly knitted for ultimate breathability and ventilation to prevent hotspots and keep your feet cool. FIRM SUPPORT - Our highest compression sock with arch band support that hugs your feet firmly to support your muscles and reduce fatigue so you can perform better, longer. Y SHAPED HEEL - Heel is stitched using a Y shape for a snug fit that moves with your foot without any bunching or slipping. MADE IN THE USA: Swiftwick Socks are designed and crafted in the USA