Stego has combined years of expertise and knowledge with customer feedback to make performance socks that are not only built specifically for their customers, but are also engineered from the inside out. StrideTec and RunTec socks are made of high-quality performance fibers like polyester, while EnduroTec features a blend of Merino wool that all work to wick away moisture and heat for a more comfortable, thermally balanced sock. Reach your peak performance with Stego. MADE IN USA. LIFETIME GUARANTEE.