Increased breathability with mesh panels on top of the foot, a new smooth ribbing upper that stays put forever, and extended cushion over the Achilles – just a few heavy additions to one of the lightest hike socks out there. Specs Performance Fit: No slipping, no bunching, and no blisters. Fine Gauge Knitting: Unprecedented durability and our unique “put it on, forget it’s on” feel. Fast Action Wicking: Pulls moisture away from skin. Fast drying. All Weather Performance: Cool in the summer, warm in the winter. Guaranteed For Life: No strings. No conditions. For life. Merino Wool is fast drying, breathable and odor resistant for all-day comfort. Materials: 54% Nylon 43% Merino Wool 3% Lycra Spandex Height: Micro Crew Weight: Lightweight Pair with: Hiking shoes, trail runners, fresh mountain air