Rank #6 in Best ISOFIX Car Seats 2026: 10 Ranked, and the Spec Fields That Fight the Copy
globalkids i-Size High Back Booster, 100–150cm
Price and rating as shown on Amazon when we collected them. Both change.
The globalkids i-Size High Back Booster is the number 6 pick in this guide. It is a Group 2/3 booster for children of roughly 3 to 12 years, listed at 100-150cm and 15-36kg, priced at £69.89 and rated 4.6 out of 5 from 460 ratings. The copy sells it as a seat you can fit either way: one bullet says "You could use in cars with or without Isofix", another says Isofix installing and uninstalling can be easily done, with red and green markings against misuse.
The specification table underneath says something else. Under Installation Type it reads "Seat Belt". The same table also lists a Rear Facing Maximum Weight of 36 kilograms on a seat whose Orientation is given as Forward Facing and which is sold for 100-150cm — a height band no rear-facing seat covers. That is the pattern this guide keeps running into: the marketing text and the manufacturer's own data fields disagree about how the seat attaches to the car, and the buyer has to work out which one they are actually getting. Everything on this page is taken from the Amazon listing, not from testing we carried out ourselves.
How those 460 ratings break down
An average hides its own shape. This is the spread behind the 4.6 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £69.89 |
|---|---|
| Rating | 4.6 out of 5 from 460 ratings |
| Installation Type (as listed) | Seat Belt |
| Orientation (as listed) | Forward Facing; the same table also lists Rear Facing Maximum Weight 36 kg |
| Harness Type (as listed) | 3-Point |
| Child Height Range | 100-150 centimetres |
| Child Weight Range | 15-36 kilograms |
| Best Sellers Rank | 71 in Car Seats (Baby Products) |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“Very happy with the seat my granddaughter loves it comfortable and serdie. Quite delivery thank you”
Verified purchase“Good seat and enjoyed by grandchildren.”
What it is up against
The rivals it was ranked against in Best ISOFIX Car Seats 2026: 10 Ranked, and the Spec Fields That Fight the Copy.
Questions people ask
Does the globalkids i-Size booster fit with ISOFIX?
The bullets say it can be used in cars with or without Isofix and that Isofix installing and uninstalling is easily done. The specification table's Installation Type field reads "Seat Belt". The listing does not reconcile the two, so it is worth checking the fitting instructions before buying.
What age and size of child is it for?
The listing gives approximately 3 to 12 years, 100-150cm and 15-36kg, described as a Group 2/3 booster.
Is the globalkids i-Size booster rear facing?
The specification table lists Orientation as Forward Facing, and it is sold for 100-150cm. The same table also lists a Rear Facing Maximum Weight of 36 kilograms, which does not match a forward-facing booster for that height range.
What harness does it use?
The Harness Type field reads 3-Point, which fits a Group 2/3 booster where the child uses the car's own three-point belt. No built-in harness is mentioned in the bullets.
How adjustable is it?
A bullet says the headrest height and backrest width adjust as the child grows, and the specification table lists 11 height positions. The cup holder is described as removable and able to be fitted on either side.
What does the globalkids i-Size booster cost?
The listing price is £69.89, with a rating of 4.6 out of 5 from 460 ratings.
Comments
Reader comments are not checked against the manufacturer's claims above.
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