The Hiker delivers more for those who need it most. Performance Trail Fit means no bunching, no slipping, no blisters. Side vents deliver superior breathability. Legendary Darn Tough construction never backs down-always goes further. Fit & Design: 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 Merino Wool is fast drying, breathable and odor resistant for all-day comfort Additional Details: Guaranteed For Life: No strings. No conditions. For life. Cushion in the Hike/Trek category features terry loops under the foot, and in the taller styles reaches above the ankle for comfort and protection