Ultra-lightweight and quick-drying ArmourDry technology improves performance. It disperses moisture evenly, allowing sweat to evaporate faster for a lighter, drier, cooler run. Breathable mesh ventilation ducts where it's needed most. Arch support helps reduce leg fatigue. Anti-odor technology reduces odor in the sock. The seamless toe box provides excellent comfort and reduces irritation. Specific fit and design for left/right side. Reflective logo for running in low light.