Altera Men's Conquer Light Weight Over The Calf Socks 63% Alpaca 30% Nylon 1% Silver 6% Spandix Made in US Unconditional Lifetime Warranty Moisture Wicking Alpaca's hollow core fiber wicks moisture away from feet, offering supreme comfort Flame Resistant Alpaca is a Class 1 rated flame resistant fiber for maximum confidence in extreme conditions Thermal Regulation Alpac's superior hollow core fiber insulation is warm in cool weather and cool in warm weather-helping to regulate body temperature Made in the USA Unconditional Lifetime Warranty