The Darn Tough Sobo Micro Crew Hiker comes with a touch of cushioning in blister-prone zone. The lightweight hiking women'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 micro crew height sock is light and strong with a versatile construction. It comprises of 52% nylon, 45% merino wool and 3% lycra?Â« spandex.