Darn Tough is so confident in its products that it backs them up with an unconditional lifetime guarantee. This sock has earned a place in the hearts of many discerning hikers because of its dependability. Cushioning along the bottom of the foot provides the perfect amount of support while a smooth, performance fit assures no slipping, bunching, or blisters. Fine gauge knitting makes this Merino Wool sock supremely comfortable, breathable, and fast-drying. This 'all-weather' sock stays cool in the summer and warm in the winter plus it’s naturally antimicrobial so it repels bacteria and odor.