To use these socks, simply put them on like you would any other pair of socks. They're great for everyday wear, whether you're going to work, running errands, or just relaxing at home. As for care, it's best to machine wash them in cold water with like colors. Avoid using bleach as it can damage the fabric and fade the vibrant cartoon patterns. After washing, tumble dry on low heat or lay them flat to dry. This will help maintain the shape and quality of the socks. And remember, these free - size socks are designed to fit feet from EUR 36 - 43, so they should offer a comfortable fit for a wide range of people.