The Smartwool PhD Run Light Elite Micro Socks are a top-rated option for women's ultrarunning. These socks are made from a blend of merino wool and synthetic fibers, offering excellent moisture management, temperature regulation, and odor control. The light elite cushioning provides targeted impact absorption and support for long-distance runs. The 4 Degree Elite Fit System ensures a secure and comfortable fit, while the seamless toe closure prevents blisters and irritation. These socks have a micro height that offers minimal coverage and stays in place during intense workouts. The Smartwool PhD Run Light Elite Micro Socks are known for their durability and performance, making them a popular choice among ultrarunners.