Men's RFL Over-the-Calf Ultra Light SocksBreathe easy. Bringing together smooth Merino Wool feel, next to skin fit, flex and fatigue zapping arch support, and targeted venting the Darn Tough ultra lightweight RFL is the sock experience your hard charging feet have been dying for, lap after lap. Material Merino Wool: The ultimate fiber for breathability and comfort in all conditions. 55% Nylon 42% Merino Wool 3% Lycra Spandex Length Over the Calf Height: The name says it all. The ultimate
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