Nothing says go far. feel good. like the updated Smartwool Hike Light Mid Crew socks (formerly known as PhD Outdoor)designed to help you hike how you like comfortably. Theyve reimagined the perfect Merino wool hiking sock by using recycled nylon for sustainable construction and improved durability and breathability zones for unwavering comfort. This hiking sock offers a womens-specific fit and features Indestructawool technology for even more durability, the 4 Degree Elite Fit System for a dialed, performance-oriented fit, and a Virtually Seamless toe for less pressure and more comfort. Light cushion on the bottom of the sock also helps add in-shoe/boot comfort on rough trails.