The Women’s Classic Hike Light Cushion Crew Socks have remained mostly the same, especially in their unmatched levels of comfort, while the sock’s upgraded construction now consists of sustainably sourced Merino wool and recycled nylon. The socks are also enhanced with Smartwool’s Virtually Seamless™ Toe, which creates smoothed out toe seams for the ultimate in-shoe fit and comfort. Care Instructions Machine wash warm. Wash inside out. Do not bleach. Tumble dry low. 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.