Merino Wool liners are perfect for a wide range of temperature and humidity conditions, on their own or underneath a heavier sock to keep you dry and comfortable. Great for hiking, walking, work and tactical use.Specifications and Features: 79% Wool, 19% Polyester, 1% Nylon, 1% Spandex Machine Wash Warm. Wash with Similar Colors Do not Bleach Tumble Dry Low. Do not Iron Itch-free merino blend OTC merino blend Ultra thin Reinforced heel and toe 2-Pair Pack