The Women's Run Zero Cushion Low Ankle Socks by Smartwool are advanced and highly functional running socks that give you an exceptional running experience. The 4 Degree Elite Fit System offers you a secure fit of the socks without slipping and a performance-oriented fit. The Achilles tab also prevents the socks from slipping into the shoes. On the outside, you'll find nylon reinforcements for more durability, while the inside of the sock is lined with merino wool - this offers all the benefits of wool - anti-odour, temperature-regulating - and a bonus on top of that: unparalleled comfort. The virtually seamless toe box (Virtually Seamless Toe) ensures an even better fit and a higher level of comfort. The integrated mesh ventilation zones guarantee high breathability. With the Run Zero Cushion Low Ankle Socks, you have found your perfect running partner.