70% Ultraspun Polyester, 27% Nylon, 3% Spandex. Designed with no dyes in foot to avoid irritating sensitive skin. Moisture management wicks away moisture for cooler, drier comfort. Full cushion comfort. Reinforced toe and hell. Embedded arch support reduces foot fatigue. Rib stay-up top for a secure, comfortable fit. Smooth toe seams for all day comfort.