Injinji's Outdoor series is designed to withstand harsh conditions and tough terrain. They are made of NüWool ™, a Merino wool that keeps the foot dry and warm. Works just as well in warm conditions as in the Swedish winter. An intermediate cushioning under the foot absorbs shocks and the elastic effectively prevents dirt and debris from entering the sock. Recommended for hiker and as a running stocking during early spring, autumn and above all as a winter stocking for all runners.