Railroad Black Therapeutic Health Track Socks - 991-BL. 2 Pack Natural Cotton Therapeutic Sock. No bind comfort top for DIABETICS. The railroad men health track sock is perfect for Diabetics, individuals with sensitive feet, Edema, or issues with circulation in general. This sock has a non-bind top to ensure maximum comfort. Content: 95% Cotton, 3% Nylon 2% Elastic. Made In USA.