Made in USA PREMIUM MERINO WOOL: 81% Merino Wool, 16% Nylon, 3% Lycra OUTDOOR PERFORMANCE: Moisture-wicking, temperature-regulating and odor-resistant properties keep your feet fresh on and off the trail. Breathable Merino Wool keeps you warm when it’s cold and cool when it??s hot. Reinforced, full-cushion knit absorbs impact and provides extra padding for tired feet. Seamless toe closure technology provides all day comfort while preventing bunching and blisters. Any season, all-weather, lasting durability. SUSTAINABILITY: Every purchase plants a tree in a forest affected by wildfire, deforestation or other human impact. Official Reforestation Partner: One Tree Planted, 501(c)(3) Nonprofit. Root Republic is a family owned and operated business based in California. Our socks are built tough and proudly Made in the USA using sustainable methods and materials only. Bluesign Sustainability Certified. OUR GUARANTEE: Our socks were built to last. We stand by our products and guarantee life-time durability. If you have any questions, comments or concerns please feel free to contact us. Trusted and recommended by military, law enforcement and rescue personnel. The ultimate boot socks for hiking, backpacking, trekking, camping, work, travel, adventure and everyday use. Proudly Made in the USA. CARE: Machine wash cold, lay flat to air dry.