Travelsox, Travel Graduated Compression & Walking Socks, Cooling Channel Plantar Arch Support, TSC1000HC, Pairs 75% Mercerized Cotton, 15% Elastam Lycra 10% Polyamide Nylon Superior Comfort & Fit: Small (W5.5-8, M5-7), Med (W8.5-11, M7.5-10), Large (10.5-13), Xl (M13.5-16) Natural Fiber: High-End, Cool Egyptian Mercerized Cotton For Exceptional Performance Higher Compression: Patented Graduated Compression Ideal Range 14-22 Mm Hg Cooling Channel: Ventilation Horseshoe Channel Provides Better Air Flow And Leg Cooling Similar To Marathon Technology Foot-Leg Care: Not a Quick Fix But Part Of Long Term Care To Keep Your Legs Healthy