Montbell merino wool socks. I bought these to wear with my trekking shoes. I bought two pairs and used them for about 10 days. I'm selling them because they're the wrong size now. *I am also selling the other pair, so I would appreciate it if you would consider purchasing them together. Product Information: These socks are made of warm, comfortable merino wool. They regulate humidity according to the amount of perspiration, keeping your feet comfortable inside your shoes. Also, the entire surface is made of pile fabric, providing excellent cushioning and a soft feel. Specifications: Material: 78% wool + 17% polyester + 5% polyurethane