The CoolMesh™ ll 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. The majority of the Coolmesh II sock fiber content is made with Repreve® Polyester. Repreve® yarns are made from recycled plastic, helping you enjoy blister-free runs, walks, and hikes while protecting the trails beneath your feet.