The Wigwam Ironman Spectrum Pro Low cut is an ultralight running sock featuring the Ultimax moisture management system that rapidly moves moisture upward so it can evaporate quickly. It has been enhanced by the introduction of Dri-Lease fabrication for dry feet, no blisters and no odor. It also features 20% Merino Wool for warmth and softness. It has foot hugging fit. Wigwam is a 105 year old United States manufacturer of socks and provides a 2-year performance guarantee.