Inner Layer: 70% REPREVE Polyester, 26% Nylon, 4% Lycra / Outer Layer: 71% REPREVE Polyester, 24% Nylon, 5% Lycra Machine Wash Our new CoolMesh II women’s line is tapered and slim-fitting for active female feet. Blister-Free socks - No Blisters, Guaranteed! Repreve performance fibers improve moisture management and increased durability Mesh panel for enhanced air flow and cooler feet Double Layer provides year round comfort and performance with no blisters- guaranteed. For optimal performance, launder before wearing. Machine wash warm, inside out. Do not bleach or use liquid fabric softeners. Tumble dry, no heat. The Coolmeshll is our #1 selling style worldwide! It’s the most breathable lightweight Double Layer 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.