Knitted fabric with ultra-fast-drying ArmourDry technology keeps feet light, dry and cool. ArmourDry technology helps disperse moisture and allows sweat to evaporate quickly. Breathable mesh ventilation zones on the top and bottom of the foot, exactly where it's needed most. Strategically positioned in the toe and heel, Bounceback suspension protects high-impact areas without much volume. The new Locked-In Fit construction keeps the sock securely attached to the heel. Arch support helps reduce foot fatigue. Padded back with a snug heel that adapts better to the foot. Seamless toe for more comfort and less irritation. Reflective logo for running in low light. One pair.