Under Armour Armour Ua Essential Ultralowtab 3pk Trainer Sock Unisex Adults. Ultra-thin, lightweight construction for a barely there feel. Front comfort tab protects top of foot from lace bite & irritation. Interior no-slip silicone grips on back of heel helps keep your socks from sliding down. Fitted heel contours around foot for a better fit. Seamless Toe delivers superior comfort & reduced irritation. Material wicks sweat & dries really fast.