A HEAVYWEIGHT Boot Sock work sock made of 85% hi-bulk Acrylic, 10% Stretch Nylon, & 5% Spandex. Gray Sock with Black Top, Heel & Toe. KEY Logo embroidery on the foot. One STRETCH size (10-13). Key Industries has manufactured top quality apparel, loaded with features, at great prices, for over 100 years. Key workwear has its roots with the farmers, railroad workers, loggers, carpenters, road pavers, bricklayers and others who need the best-made garments available.