Acylic/Nylon/Polyester/Merino Wool/Spandex Blend - Navy: 47% Acrylic/ 17% Nylon/ 16% Merino Wool/ 16% Polyester/ 2% Spandex/ 2% Other Fibers - Merino Wool and blended yarns naturally keep you dry and cool - Contains spandex for a perfect fit that won't slip - An arch support keeps the sock in place - Mesh cooling channels allow feel to breathe and keep you completely comfortable - **Fabric contents vary by color -