Perform with the power and comfort of ZQ-certified Merino wool in the Hike Light Cushion Crew socks—formerly known as PhD® Outdoor.  Smartwool updated their best women's hiking socks to include more sustainable materials with the addition of recycled nylon, improved durability and mesh zones, and an even more perfect fit. A crew height helps add coverage on the trails and light cushioning along the entire bottom of the foot helps keep you comfortable when the ground isn't. Take care of your feet with the best-fitting, best-feeling hiking socks.