The Darn Tough Light Hiker Micro Crew Black Men's sock features the most versatile construction. It includes increased breathability with mesh panels on top of the foot, a new smooth ribbing upper and extended cushion over the Achilles. The benefits also include a performance fit, True SeamlessT, Fine Gauge Knitting and Fast Action Wicking. It is naturally antimicrobial and is guaranteed for life. The light cushioned micro crew height sock comprises of 54% nylon, 43% merino wool and 3% LycraÂ® spandex.