Cushioned back tab with fitted heel that contours around foot for a better fit. Odor control technology reduces odor in the sock. Arch support helps reduce foot fatigue. New Locked-In Fit design keeps sock securely on heel for an adjustment free fit that wont fall down. Bounceback cushioning strategically placed in toe & heel protects high impact areas without added bulk. Breathable mesh ventilation zones on top & bottom of foot where you need it most. ArmourDry yarns help disperse moisture allowing sweat to evaporate quickly. Knit material with ultra-fast drying ArmourDry yarns to keep your feet light, dry & cool.