The Double Cross delivers. With half the wool yarn weight of their cushion socks, Darn Tough's lightweight cushion socks deliver lightweight performance with the perfect amount of cushioning along the base of your foot. Runners and cyclists love the streamlined performance fit of this sock and the uber comfy 17.2 micron wool construction. True Seamless technology assures a smooth fit and reduces blisters and hot spots. No slipping, no bunching, no bull. 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 when you're putting on the miles. Still made in Vermont. Guaranteed for life.