ALIXIN-10028 Bike Parts Accessories Seats Mountain Bicycle Rear Seat Cushion Thicker Seat Rear Seat.Children Back Seat,Safety Kids Bicycle Rear Seat for Outdoor.(Dual Use Adults and Children）

Does exactly what it says.

Initially seemed quite good but turned out to be useless.The base is very flexible so provides little support.The mounts are made from metal as strong as cheese.The mounting bolts spin in the frame making them very difficult to add nuts to.The mounts have no room for adjustment so it will either fit your rack or it won't.