Note: Please be aware that a seat rack is not included with this product. Designed to fit a variety of mountain and road bicycles, this accessory is compatible with seat posts that have a diameter of 31mm or less. Equipped with a smooth cover pad for enhanced comfort and health benefits, this accessory securely fastens to the seat post of your bicycle, ensuring a safe and comfortable ride. This versatile accessory not only facilitates the effortless transport of your gear but also provides a comfortable seating solution for additional riders. Embrace the joy of shared experiences by carrying your children or friends on your bicycle during weekends, transforming your leisure time into a social and enjoyable adventure.