For ISOFIX or i‑Size child restraint systems in which the child is secured using the seat belt integrated in the child restraint system, the permissible gross weight of the child and child restraint system is 33 kg.
If the child and the child restraint system together weigh more than 33 kg, the ISOFIX or i‑Size child restraint system with integrated seat belt does not offer sufficient protection. Too much load may be placed on the ISOFIX or i‑Size child restraint systems and the child may not be restrained correctly in the event of an accident, for example.
in the manufacturer's installation and operating instructions for the child restraint system used
on a label on the child restraint system, if present
Regularly check that the permissible gross mass of the child and child restraint system is still being adhered to.
When using a child restraint system, be sure to observe the manufacturer's installation and operating instructions as well as its correct use and the suitability of the seats for attaching a child restraint system.
ISOFIX and i-Size are standardised securing systems for special restraint systems. ISOFIX child restraint systems are approved in accordance with ECE R44, i‑Size child restraint systems are approved in accordance with ECE R129.
Only child restraint systems that have been approved in accordance with ECE R44 may be attached to ISOFIX mounting brackets.
ISOFIX child restraint systems that are approved in accordance with ECE R44
i‑Size child restraint systems that are approved in accordance with ECE R129
