85% cotton and 15% spandex. Soft and breathable. 100% brand new! It is flexible, simple, durable and machine washable Made of high quality firming skin cotton. Very comfortable and soft and warm. Appropriate elastic design to ensure that socks do not block blood circulation. Cute dinosaurl design socks are perfect for personal use and a good gift for Christmas or birthday gifts. Size guide: 4-9 years old Quality Assurance: If you encounter any problems, please contact us, we will do our best to help!