Smartwool Hiking Full Cushion Crew Socks for Men, formerly PhD Outdoor, use cushioning on the entire sock to help maximize warmth and protection. These responsibly sourced, ZQ-certified merino wool hike socks have top-sock tech including Indestructawool technology for enhanced durability. The 4 Degree Elite Fit System provides a dialed-in, performance-oriented fit, and the Virtually Seamless toe for maximum in-shoe/boot comfort. Improved mesh zones enhance breathability, and a ply structure reduces pilling while enhancing hand-feel and comfort. Not to mention, these best-feeling, best-fitting hiking socks are now made with recycled nylon, making them more sustainable than ever. Now that's something you can feel good in and about. 56% merino wool/11% nylon/31% recycled nylon/2% elastane. Machine wash. Imported.