Hike how you like in our responsibly sourced, ZQ-certified Merino wool Hike Light socks. Formerly known as PhD® Outdoor, these hiking socks are packed with all our tried-and-true sock innovations, like our Indestructawool™ technology for enhanced durability, our 4 Degree™ Elite Fit System for a dialed-in, performance-oriented fit, and our Virtually Seamless™ toe for even more comfort. We've extended durability zones and updates mesh areas to help maximize breathability without sacrificing the perfect sock fit. And light cushioning on the entire bottom of the foot to bring more comfort to your favorite low-cut hiking shoes. Storm more summits while taking care of your feet with our Merino wool performance socks.