The Smartwool Hike Full Cushion Lolo Trail Crew Socks have been made with a mix of responsibly-sourced Merino wool and Nylon, and boast a crew height with full cushioning for optimum comfort. Indestructawool™ technology with extended durability zones also enables them to withstand hard trail wear, while the mesh zones provide breathability to keep your feet cool, and the 4 Degree™ elite fit system lends a performance-orientated fit. Plus, the built-in comfort welt limits any bunching down of them in your boots.