Note this item is not new but eBay does not allow any other condition to be advertised.

This is used but the seat is in excellent as-new condition.

Genuine Porsche car seat (manufactured by Britax), cost new from Porsche £270+.

I have two of these for sale - my children have grown out of them.

Description from Porsche as follows:

The Porsche Junior Seat i-Size is suitable for children between 100 cm and 150 cm. The seat can be fastened in place using either the vehicle seat belt or the ISOFIX/ISOFIT system. The Porsche Junior Seat i-Size must be used as a booster seat without backrest if the child is between 135 cm and 150 cm in height. Secure the booster seat using the 3-point belt or the ISOFIX system in combination with the 3-point belt. Porsche recommends use with the backrest as this offers optimum protection for the child in the event of a side impact. The Porsche Junior Seat i-Size was developed by Porsche in a unique design and features "PORSCHE" logos on both sides.

The Porsche Junior Seat i-Size has:

multiple adjustable seat positions,

side impact protection for absorbing the forces and for monitoring the movement sequence in the event of a collision,

an integrated headrest adjustment ensures an age-appropriate seat position.

The Porsche Junior Seat i-Size meets the latest standards of the European safety standard ECE-R129/00 (i-Size).

The i-Size regulation ensures even greater child safety through improved protection of the head and neck area in the event of side and frontal impact as well as the prescribed reverse-facing driving for children up to 15 months old. A length classification in centimetres makes it easier to select the correct child seat and replaces the previous specifications in kilograms. i-Size supports the ISOFIX system, which establishes a rigid connection between the body and child seat and minimises the risk of incorrect installation.

Note: Please refer to the operating instructions for the product and the vehicle to find out which vehicles and Porsche Junior Seat i-Size car seats are registered. The child restraint systems must not be used in conjunction with sports bucket seats.