You can get a backrest for Twinny and Twinny Plus, the backrest provides extra support for the passenger sitting in the front of the bike, and helps create a more stable and comfortable sitting position. It is adjustable in both height and depth, so it can be easily adapted to the individual user.
The backrest is supplied without a harness, but a seat belt can be purchased separately if additional restraint is needed.
A simple and effective solution that increases both safety and comfort during your bike ride.