The Swiftwick Aspire Zero No-Show Socks are a popular choice among women ultrarunners for their exceptional fit and moisture-wicking properties. These socks are made with Olefin fiber, which provides excellent moisture management and breathability. The thin profile and contoured compression fit offer a snug and supportive feel. The seamless toe design prevents blisters and irritation. With their comfortable fit and moisture-wicking capabilities, these socks are highly recommended for women's ultrarunning.