The Coolmesh(TM)ll is our #1 selling style worldwide! It&';s our most breathable lightweight Double Layer sock and is designed for a minimal feel. The Coolmesh(TM)ll is tapered and slim-fitting for active female feet. They&';re ideal as running socks, walking socks, or trail running socks. They&';re great travel socks that dry quickly and are ready for use the next morning. OUR RUNNING SOCK FEATURES Mesh panel for enhanced air flow and cooler feet RepreveA(R) 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! BLISTER-FREE RUNNING SOCKS FIBER CONTENT These anti-blister activewear socks are composed mostly of eco-friendly RepreveA(R) Polyester. RepreveA(R) running socks are made from recycled plastic bottles, helping you enjoy blister-free adventures while protecting the ground beneath your feet. Inner Layer: 70% RepreveA(R) Polyester, 26% Nylon, 4% LycraA(R)Outer Layer: 71% RepreveA(R) Polyester, 24% Nylon, 5% LycraA(R) Finding the right fit is essential for blister prevention! You can view our sizing chart below. We 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, family-owned business, we thank you for choosing Wrightsock anti-blister running socks. ANTI-BLISTER RUNNING SOCK SIZING GUIDE