TOP TETHER is a supplementary fastening system that serves to increase the stability of the car seat when using ISOFIX. It is a third anchor point - a strap that attaches to a designated anchorage in the rear of the vehicle (e.g. behind the rear seat backrest or in the luggage compartment). Its function is to prevent the seat from rolling forward in a collision. The use of the TOP TETHER is mandatory for certain types of car seats according to the i-Size standard and contributes to maximum protection for the child in the event of an accident.