A sock is nothing without durability and that’s why Smartwool integrated its very own “Indestructawool” technology in its PhD Slopestyle Medium socks. The tech blends a patent-pending blend of ultra-tough yarn that combats wear and tear. The use of two separate elastics allows the sock to stretch and retain shape for a comfortable, anatomically correct fit and seamless toe seals the deal, getting rid of any awkward bunching.