Opt for the performance, power and comfort of responsibly sourced, ZQcertified merino wool in our Hike Light Cushion Crew socks. Previously known as PhD Outdoor, our best hiking socks have been updated with more sustainable materials. Using recycled nylon, they're stronger, fit even better and are even more breathable thanks to mesh zones. But don't worry. The technologies that make our socks so successful are still there, giving you all the comfort and performance you expect from Smartwool. Their Crew height also offers greater protection on the trails, while light cushioning along the bottom of the foot will keep you comfortable even on difficult terrain for long hikes.