Our Full Cushion Crew Hiking Socks, previously known as PhD® Outdoor, feature full cushioning for optimal warmth and protection. Crafted from responsibly sourced, ZQ-certified Merino wool, these socks are equipped with advanced technologies like Indestructawool™ for superior durability, the 4 Degree™ Elite Fit System for a precise, performance-driven fit, and a Virtually Seamless™ toe for enhanced comfort in boots or shoes. We've updated the design with improved mesh zones for better breathability and a new ply structure to reduce pilling while boosting softness and comfort. Plus, with the addition of recycled nylon, these hiking socks are more sustainable than ever—offering both comfort and eco-consciousness you can feel great about. Features- Indestructawool™ technology with extended durability zones 4 Degree™ elite fit system for a dialed-in, performance-oriented fit Additional body-mapped mesh zones for added breathability Virtually Seamless™ toe for enhanced comfort Comfort welt with 'stay put' fit Formerly known as PhD® Outdoor Country of Manufacture: Italy Composition- 61% Merino Wool, 37% Nylon, 2% Elastane Sizes- UK Medium 5-7.5 Large 8-10.5 X-Large 11-13.5