Altera Men's Explore Light Weight Crew Socks 45% Alpaca 15% Nylon 1% Silver 5% Spandix 25% Hydrotec Made in US Unconditional Lifetime Warranty Made in the USA Moisture Wicking = Alpaca's hollow core fiber wicks moisture away from feet, offering supreme comfort Easy care Machine washable/Dryer safe Thermal Regulation Alpaca's fiber insulation is warm in cool weather and cool in warm weather Silver infusion: Alpaca fibers infused with precious metals for naturally odor free and antimicrobial comfort helps combat symptoms of athlete's foot Terry Loop Construction Arch Support and Reinforced Hell & Toe Unconditional Lifetime Warranty Made in the USA