Go-to coverage and blister-proof fit for competition level mileage and savage vertical gain. This favorite running sock is redesigned to be ultra-lightweight and perform better. Built from the ground up with thermoregulating Merino Wool, this micro crew blends a buttery upper with a reinforced heel, sole and toe box, fatigue-alleviating arch support and engineered forefoot mesh zones for the most durable, best fitting sock you can find.