With the performance, power and comfort of responsibly sourced Merino wool the SmartWool Performance Hike Light Cushion Crew socks provide a lightweight technical option for your feet. Formerly known as PhD® Outdoor, they\'ve been updated to include more sustainable materials with the addition of recycled nylon, improved durability, updated mesh zones, and an even more perfect fit. The crew height also adds extra coverage on the trails and light cushioning on the entire bottom of your foot helps keep you comfortable when the ground isn\'t.Smartwool Performance Hike Light Cushion Crew Features: 58% Merino Wool, 28% Recycled Polyamide, 12% Polyamide, 2% Elastane Mesh Ventilation Zones Optimum Moisture Management Maximum Breathability Light Cushion Seamless Construction Indestructawool™ Technology Features Exceptional Durability and Comfort Comfort Welt with \'Stay Put\' Fit