Crafted with Merino wool, the Pursuit features a reinforced heel and toe for maximum durability, even at shorter cuff heights. Merino provides warmth in winter, cooling in summer, and optimized moisture absorption. Contoured compression® Fiber First® Made in USA Moisture Wicking Lifetime Performance Guarantee Fabric tech Natural Merino Wool Year-round temperature control keeps you warm in winter and cool in summer. CUSHIONING Medium For versatile comfort COMPRESSION Moderate For flexible support best for Trail Running Cycling Hiking Natural Merino WoolMoves moisture away from feet keeping them dry and blister-free. Flex ZonesConstructed with a half-density weave to prevent bunching at your feet's flex points. Thin Channeled UpperProvides ventilation and incresases breathability. Details Natural Merino moves moisture away from your feet, keeping them dry, odorless, and blister-free Temperature control keeps you warm in winter and cool in summer Material & Care 64% Merino wool / 33% Nylon / 3% Spandex Machine wash cold. Tumble dry low. Do not bleach or iron. Our Guarantee Swiftwick socks are made to endure through thick and thin. The Lifetime Performance Guarantee is our commitment both to our products and to our customers, ensuring our socks stand the test of time.If your Swiftwicks wear out for any reason, we’ll replace them. Simple as that.