QCS Men’s Medical Socks are fashioned with controlled compression, which assists the muscles in pushing the venous blood up the legs back toward the heart. Improved circulation thus reduces leg fatigue. In addition, QCS Men’s Medical Socks meet the needs of the active man. Provide long lasting support for the most demanding of lifestyles. Directions: Laundering: Wash gently with mild soap or detergent in lukewarm or cold water. Do not wring or twist. Do not bleach. Rinse until water is clear. Roll in a towel to remove excess moisture. Dry flat away from heat and sunlight. Size Chart: Small/Medium: Fits shoe size 7.5 – 10. Medium/Large: Fits shoes size 10.5 – 12. X-Large: Fits shoe size 12+.