To use this Harry Potter Dobby Odd Socks Advent Calendar, start opening one door each day as you count down to Christmas. You'll find a cool Harry Potter - themed sock behind each door. These socks are unisex and one - size, fitting a wide range of foot sizes. When wearing them, just put them on like you would any normal socks. As for care, it's best to follow the normal sock - washing routine. Machine - wash them in cold water with like colors and tumble dry on low. Avoid using bleach as it might fade the cool Harry Potter designs. And that's all you need to know to enjoy this special advent calendar and your new Harry Potter socks!