Caution: we've been told that once you try our men’s PhD running socks, you may never settle for a lesser sock again. They’re made with Indestructawool technology to add extra durability to high-impact areas, and trail-tested for proven comfort. Our line of men’s PhD socks offers a variety of heights and weights, from heavy trekking and hunting (or lounging) socks to ultra light wool running socks. Try a pair and find out why only the best men’s running socks earn the highest degree of performance.