Perfect fit. Powerful durability. That's what you get when you put on Smartwool's responsibly sourced Merino wool women's Hike Light socks. Formerly known as PhD® Outdoor, these socks feature the top sock innovations and women's-specific fit,. Updated mesh zones, and increased durability, they've upgraded these hike socks to help you push any summit or enjoy any trail in absolute comfort. Light cushioning along the entire bottom of the foot offers a snug fit in your favorite low-cut hiking shoes. The addition of recycled nylon makes for a more sustainable sock construction.