Ultra-light & fast drying ArmourDry® yarn technology improves the performance of your shoe Evenly disperses moisture, allowing sweat to evaporate faster for a lighter, drier & cooler run Energy return cushioning on ball of foot & toe for added protection in high-impact areas without added bulk Interior no-slip silicone grips on back of heel helps keep your socks from sliding down Seamless toe delivers superior comfort & reduced irritation Front comfort tab protects top of foot from lace bite & irritation Odor control technology reduces odor in the sock Left/Right specific fit & design