The Classic Hike Full Cushioning Crew Socks are made from responsibly sourced, ZQ-certified Merino wool and recycled nylon. This super soft combination ensures long lasting comfort, with full cushioning throughout the sock for added warmth and protection. The socks are also built for movement with Smartwool’s unique 4 Degree Elite Fit System which delivers a dialled-in, performance-orientated fit with a flex zone at the ankle joint. Care Instructions Machine wash on a warm, gentle cycle. Do not bleach. Do not iron. Do not dry clean. About Smartwool's Merino Wool ZQ Merino is used to ensure the sheep that produce the wool are treated humanely, the wool growers are treated fairly, and the farms work to minimise their impact on the environment. Smartwool also helps protect the areas and activities we love by partnering with advocacy organisations that align with its values.