The Conquer tactical sock that is engineered for superior comfort & support in any conditions. Premium terry loop construction built in arch support cushioning environmentally sound alpaca fiber sock offers insulates upto 30% better than merino wool in any condition war or cold.Specifications and Features: 63% Alpaca 30% Nylon 1% Silver 6% Spandix Made in US Machine Wash 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