Need a sock that can keep up with you on your longest trail runs? Look no further. Our Women's PhD Pro Endurance Print Crew socks feature Shred Shield technology to reduce wear from toes, along with Indestructawool technology for a more durable sock. We use minimal and targeted sole cushioning and malleolus ankle cushion designed for protection on the most rugged trails. Top that off with a dialed fit and in-shoe comfort and these Merino socks were built to go as far as you want to go, with unwavering comfort and performance.