The soft seat is fitted in the box and includes a lap safety belt. One or two Y-belts can also be mounted for extra safety. Two children can be seated, and the space below the soft seat can be used for storage. When not in use, the soft seat can easily be moved up and locked with the lap safety belt to use all the space of the box. The soft seat can fit up to two children or a max payload of 50 kg. It is made of durable water repellent polyester 400 D with a PU coating.