Nothing says "go far. feel good.™" like Smart Wool's updated Hike Light Mid Crew socks (formerly known as PhD® Outdoor)—designed to help you hike how you like comfortably. Smart Wool has 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 women's-specific fit and features our Indestructawool™ technology for even more durability, our 4 Degree™ Elite Fit System for a dialed, performance-oriented fit, and our 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.