What does ‘i-Size’ mean?

The second phase of UN R129 contains different categories: the ‘i-Size booster seat’ category and the ‘specific vehicle booster seat’ category.

The ‘i-Size booster seat’ category ensures you that a booster seat in this category fits in all positions in a vehicle that have an i-Size marking themselves for a child’s stature height up to 135 cm. Additionally, it allows for a maximum width of 44 cm for the booster seat and requires stowable ISOfix connector arms, so that the booster seat can be installed both with and without ISOfix.