The Men's Run Quarter Ultra-Lightweight with Cushion (Style 1040) is built for high-mileage running with the comfort to keep up. The redesigned 1/4-height cuff adds ankle coverage with silky next-to-skin ribbing, while breathable flex zones in the forefoot and fatigue-zapping arch support deliver a true performance fit: no slipping, no bunching, no blisters. Soft terry loops under the foot provide lasting rebound, and ultra-lightweight Merino wool wicks moisture and resists odor. Knit in Vermont, USA and backed by Darn Tough's Unconditional Lifetime Guarantee. 50% Merino Wool / 46% Nylon / 4% Lycra Spandex.