The CoolMesh(TM) II is our #1 selling style worldwide! It&&';;s the most breathable, lightweight, Double Layer, anti-blister sock and is designed for a minimal feel. Ideal as running socks, walking socks, or light hiking socks. Great travel socks that dry quickly and are ready for use the next morning. Blister-Free Sock Features Mesh panel for enhanced airflow and cooler feet Recycled Polyester performance fibers improve moisture management and increased durability Stabilizer Zone(TM) in arch locks sock in place Styles and colors for all tastes Blister-Free socks - No Blisters, Guaranteed! Made in the USA at the Wrightenberry Hosiery Mill in Burlington, NC Eco-Friendly Fiber Content Inner Layer: 70% Recycled Polyester, 26% Nylon, 4% LycraA(R) Outer Layer: 71% Recycled Polyester, 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. The majority of the Coolmesh II Over the Calf sock fiber content is made with Recycled Polyester. Recycled Polyester yarns are made from recycled plastic, helping you enjoy blister-free runs, walks, and hikes while protecting the trails beneath your feet. Blister-Free Sock Sizing Finding the right fit is key to preventing blisters! We invite you to view our sizing chart below. Please do not hesitate to contact us for any additional information, or head on over to our FAQ page for answers to common customer questions. As an American-made, family-owned business, your support means the world to us. Thank you for choosing Wrightsock.