The CEP Women's Dynamic Plus Run Merino Sock features a unique combination of premium merino wool, polypropylene, and high tech spandex. This results in an excellent anatomical fit, a comfortable feel, and an extremely durable sock. With an optimal thermal balance for high aerobic athletes and excellent heat and moisture management, you may just start wearing this thing everywhere you go. Strategically placed padded zones relieve pressure while the close fit helps prevent blisters. An extra flat toe seam reduces irritation, and antimicrobial properties help to reduce odor.