The Darn Tough Pinnacle Micro Crew Charcoal features a sleek cuff that slides on smooth, along with the trail-rated toughness. The lightweight hiking 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 micro crew height sock is light and strong with a versatile construction. It comprises 50% nylon, 47% merino wool, and 3% lycra spandex.