They're made from responsibly sourced, ZQ-certified Merino wool (translation: super-soft, super-sustainable) and come with all comfort points, like recycled nylon for extra durability and mesh zones for breathability. Oh, and that 4 Degree Elite Fit System? It's like a hug for your feet, but, you know, a sporty one. So, whether you're scaling a mountain or just taking a walk in the woods, they'lll make your feet happy even when the trail's tough.Indestructawool Technology with extended durability zones4 Degree Elite Fit System for a dialed-in, performance-oriented fitMesh zones for added breathabilityVirtually Seamless Toe for enhanced comfortComfort welt with 'stay put' fitWeight: 0.159 lbsCountry of Manufacture: Italy58% Merino Wool, 40% Nylon, 2% ElastaneColour: Blue