The 3/4 crew running sock features the 4-Degree Fit System for high-performance fit and Duroyarn for shock absorbency and durability. • 4-Degree Banded Fit System for all day performance fit • WOW Technology in High Density Impact Zones to reduce shock & abrasion • SmartWool inside for moisture, temperature, and odor control • Duroyarn™ reinforcement for added comfort & durability • Strategic Mesh Zones for maximum ventilation • 74% Wool, 25% Nylon, 1% Elastic |