Take our most popular lightweight style, Coolmesh ll socks, add merino wool to the outside layer only and you&';ll have a super lightweight design with all the values of wool- natural moisture absorption, temperature control, no smell, and best yet, no woolly scratch against the skin. These blister-free socks are great for walking, trekking, trail running, hiking, and backpacking. Hiking Sock Features Mesh panel for enhanced airflow Recycled Polyester fibers improve moisture management and increased durability. Stabilizer Zone(TM) in arch locks sock in place. Blister-Free socks - No Blisters, Guaranteed! Eco-Friendly Fiber Content These eco-friendly anti-blister hiking and running socks are made with Recycled Polyester fibers. Recycled Polyester materials are created from recycled plastic bottles, helping you enjoy blister-free hiking adventures while protecting the trails beneath your feet. Inner Layer: 70% Recycled Polyester, 26% Nylon, 4% LycraA(R) Outer Layer: 71% Merino Wool, 24% Nylon, 5% LycraA(R) Double Layer Seamless Toe Wrightsock&';s Double Layer styles offer a seamless toe like most performance socks do these days; however, as you can see on the below images, Wrightsock&';s seamless toe looks a bit different. This is due to the required attachments that connect the inner and outer layers together for our Double Layer system. Even though it looks a bit odd, our seamless toe acts and feels the same on your foot as any other seamless toe design. Blister-Free Hiking Sock Sizing Guide Finding the right fit is essential for keeping you blister-free! For more information, view our sizing chart below. We also invite you to contact us for any additional information or head to our FAQ page to find the answers to common customer questions. As an American-made product and a family-owned business, we thank you for choosing Wrightsock.