Midweight CoolMax (R) crew sock. 50% CoolMax (R) polyester 28% nylon 20% acrylic 2% spandex construction in this sock will keep you warm and dry all day, every day. Includes anti-odor properties, mesh side channels for better ventilation and breathability, non-terry vamp at the ankle and terry loop leg to provide added comfort. When it comes to rugged, high performance socks, this crew length item is a great year round workwear choice.