The Darn Tough Solid Basic Crew Charcoal women's sock features neutral colors that offer versatility fit and the natural fibers provide an endless comfort. The sock features merino wool, fine gauge knitting, fast action wicking and true SeamlessT to offer an ultra smooth, invisible feel. The sock is guaranteed for life and is naturally antimicrobial. The crew height sock is built light, darn comfortable and super strong to provide a lightweight, sure fit. It comprises of 66% merino wool, 32% nylon and 2% lycra?Â« spandex.