The Dexshell Pro Visibility Socks were designed to have the reflective stripes around the cuff area, to make sure you're visible when you do cycling or other activities in the dark. The socks are constructed with the light weight moisture wicking COOLMAX® FX liners to keep your feet dry and comfortable in those muddy or rainy weather conditions. Dexshell Pro Visibility Socks Features Outer Shell: 97% polyamide, 2% elastane, 1% polyester Interlining: Porelle® membrane (100% PU) Inner Sock: 76% COOLMAX® FX(polyester) , 24% polyamide