Darn Tough is so confident in their products that they back up their products with an unconditional lifetime guarantee.  Full Cushioning throughout this entire sock provides support and comfort without unwanted weight and bulk. Coveted for its dependability and comfort this sock has a smooth performance fit that you won’t find in the other guy’s full cushioned socks. No slipping, no bunching, no blisters. Fine gauge Merino Wool makes this a fast drying and breathable "all-weather" sock that stays cool in the summer and warm in the winter. And since Merino Wool is naturally antimicrobial this sock repels bacteria and odor.