Tommy John Men's Ultimate Liner Sock Solid Color 2 Pack 61% Combed Cotton, 33% Polyester, 5% Spandex, 1% Nylon Imported Machine Wash Invisigrip technology - grips foot to ensure sock stays put Y-heel - creates custom fit and eliminates bunching Zoned cushioning - increased support, comfort, and extended wear Arch support - light compression increases blood flow Stay Dry - zoned ventilation keeps feet cool and dry