Smartwool Women's Run Zero Cushion Striped Low Ankle SocksYou won't break your stride, thanks to our Indestructawool(TM) technology designed for added durability and an Achilles tab designed to help prevent sock slippage. And by adding brand-new Shred Shield(TM) technology to some of Smartwool's best running socks, the wear and tear from toes is reduced, helping you push toward your finish line and achieve higher mileage.