90% Polyester, 10% Polyurethane -4-way Stretch fabric; Machine wash warm with like colors. Line dry in shade, do not tumble dry. Do not bleach. Do not iron. Do not dry clean. Seamless, variable compression 4-way stretch fabric improves circulation. Built-in webbing supports the calf muscles, ankle joint and arch. Sanitized, antimicrobial, antibacterial, moisture-wicking. Thailand