The Performance Hike Light Cushion Ankle Socks feature Smartwool’s top sock technologies including the 4 Degree Elite Fit System, which delivers a dialled-in, performance orientated fit with flex zones at the ankle joint – for the perfect balance of freedom of movement and long-lasting comfort. Meanwhile, Indestructawool technology is a patent pending construction method which combines the sock’s Merino wool and recycled nylon fabrics in a specific way that advances durability and comfort even further. Perfect for use with low-cut hiking shoes, the ankle socks also feature light cushioning across the entire bottom of the foot – providing impact absorption, and creating a super soft, padded bottom that will help you put one step in front of another, mile after mile. 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.