Knitted fabric with ultra-quick-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, right where it's needed most. Strategically placed in the toe and heel, Bounceback cushioning protects high-impact areas without much bulk. The new Locked-In Fit construction keeps the sock securely fastened to the heel. Arch support helps reduce foot fatigue. A tailored heel wraps around the foot for a better fit. Seamless toe box for added comfort and less irritation. Reflective elements and logo for running in low light. One pair.