Is it i-Size or specific vehicle ISOFIX on the orange label?

Which line on the orange label is the category?

The orange mark holds several facts at once: the circled E, the regulation (R129), an approval number, a height or weight range, and a category phrase. The category phrase is the line that answers i-Size versus Specific Vehicle ISOFIX. UNECE Regulation 129 requires that phrase to be part of the international approval mark.

The same regulation also requires a permanently attached Specific Vehicle ISOFIX label that is visible to the person installing the seat, using those words. An i-Size product must show the i-Size logo (minimum 25 mm by 25 mm in the regulation text) as well as the approval mark. A shop hang-tag is not that mark.

What exact words should I copy from the sticker?

1. 1
   Photograph the whole orange mark Tip the seat so the sticker on the shell or base is flat in the frame. Include the circled E, the R129 line, the category phrase and the centimetre or kilogram figures.
2. 2
   Copy the category phrase letter for letter Match it to one of the UNECE phrases: i-Size universal ISOFIX, Specific Vehicle ISOFIX (or specific vehicle ISOFIX), i-Size booster seat, specific vehicle booster seat, Universal Belted, or Specific vehicle Belted. Short logos still sit next to one of those categories.
3. 3
   Open the car handbook on that seating position Look for an i-Size seating-position note, not only the ISOFIX bars. GOV.UK allows ISOFIX-fitted seats; it does not treat every ISOFIX point as an i-Size position.
4. 4
   Open the maker's vehicle list if the category is specific vehicle The Baby Products Association states that a vehicle fitting list is used with R129 specific-vehicle categories. The list is a consequence of that label, not an optional extra.
5. 5
   Keep the list with the seat Child Car Seats tells you to check approval for your car with the child-seat maker or the car maker. A missing list for a Specific Vehicle ISOFIX seat means you cannot complete that check from the sticker alone.

What does each phrase change about the car?

Brand pages often say i-Size and Specific Vehicle sit under the same R129 test set. The orange label is not choosing a 'better' crash test. It is naming which vehicles the type-approval covers.

When is the vehicle list required by the label?

Treat the list as required when the category line is specific vehicle (ISOFIX, booster or belted). The BPA groups R129 specific vehicle with the R44 categories that also need a fitting list. If the car is new and missing from a published list, the BPA says to ask the child-seat maker — the list may lag a new model year.

An i-Size category seat is aimed at i-Size positions. Child Car Seats still says i-Size seats fit cars that have ISOFIX points, and you still check approval for your car. Silver Cross, writing as a brand, adds that cars can carry an i-Size mark on or near the ISOFIX point; if that mark is absent, the handbook child-safety section is the next place to look.

The car has ISOFIX. Does that make the orange label i-Size?

No. ISOFIX is the two-bar attachment system GOV.UK names for seats that do not use a diagonal belt. i-Size on the seat is a Regulation 129 category. i-Size on the car is a seating-position approval in the handbook. Those are three different lines.

• ISOFIX bars present — the car can take an ISOFIX child seat if the seat's own approval covers that position.
• Handbook says i-Size position — that is the position the i-Size seat category is written for.
• Seat sticker says Specific Vehicle ISOFIX — the bars are not enough; the model must appear on the list.

In shortCopy the category phrase first. i-Size wording points you at i-Size positions in the handbook. Specific Vehicle ISOFIX points you at the maker's list. The sticker decides which document you open next.

What if the box, the app and the orange label disagree?

Use the permanently attached orange mark and any Specific Vehicle ISOFIX label on the seat. A website filter labelled i-Size, or a base that is sold for more than one shell, can describe a range. UNECE puts the category words on the approval mark of the restraint that includes the ISOFIX attachments.

Official records show the category on the approval mark. If that mark is missing, you do not have the R129 category in writing — that is a missing-label problem, not a close call between i-Size and Specific Vehicle.