The Darn Tough No Show Hiker Grey offers performance in their lowest-profile package. The men's 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 no show height sock is built light and strong with a thin layer of cushioning along base of foot. It comprises of 54% nylon, 43% merino wool and 3% lycra?Â« spandex.