The Women’s Performance Hike Light Cushion Crew Socks are made with a comfortable combination of ZQ-certified Merino wool and recycled nylon which enhanced durability and ensures sustainability. Mesh zones and Smartwool’s 4 Degree™ Elite Fit System deliver a dialled-in, performance-orientated fit with improved breathability. Meanwhile, the socks are constructed using Smartwool’s patent-pending Indestructawool™ method which also boosts comfort and durability. 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.