Fox River Velox Quarter Crew Socks 53% nylon, 16% TENCEL?, 16% polyester, 12% NanoGlide nylon, 3% spandex. Made from tencel, these lightweight socks stand up to any adventure Spandex support: Spandex arch and heel pockets help ensure a superior fit all day Nano glide reinforced: Nano glide PTFE nylon reinforces the heel and toe to provide a long-lasting wear shield and resists friction build-up Breathable mesh: vented panels help move moisture away from the foot to keep you Dry and comfortable Our exclusive Helix fit system with full-foot volumetric compression; made in the USA