Enjoy the quality and comfort of our Hike Light Cushion socks made from ZQ certified ethically sourced merino wool. Formerly called PhD® Outdoor, our best hiking socks have had a makeover and now feature more durable materials like recycled nylon, more wear-resistant areas and improved mesh, and an even better fit. But do not worry. The technologies you love so much in our socks are still there to give you the comfort and performance you expect from Smartwool. The height of the sock also provides extra protection on the trails, and the lightweight, full-length cushioning of the sole helps less feel what's rolling under your feet.