If you're a serious thru-hiker that's miles away from the nearest town, blow outs, blisters and other sock B.S. can be disastrous. That's why we built this sock to outperform and over-deliver when you need them most. 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. Materials Full cushion: 69% Merino Wool, 27% Nylon, 4% Lycra® Spandex Cushion: 69% Merino Wool, 27% Nylon, 4% Lycra® Spandex Height: Boot Weight: Midweight