This Micro Crew has earned a hallowed place in the hearts of many a through-hiker who demand more from a sock. Comfort, durability and fit that never rests. Performance Fit: No slipping, no bunching, and no blisters. Fine Gauge Knitting: Unprecedented durability and our uniqueput it on, forget its onfeel. Fast Action Wicking: Pulls moisture away from skin. Fast drying. All Weather Performance: Cool in the summer, warm in the winter. Merino Wool is fast drying, breathable and odor resistant for all-day comfort. Material: 59% Merino Wool, 39% Nylon, 2% Lycra Spandex