High-Back Booster Seats Buyer's Guide 2026: Only the £109 Cybex Folds, Only the £210 Maxi-Cosi Lights the Buckle

COMPARISON · CAR SEATS

Most families buy a high-back booster in a hurry. The toddler seat suddenly looks tight around the shoulders, the harness is on its top slot, and a 100-150cm i-Size booster looks like a simple step up: the child uses the car's own adult seat belt, and the booster's job is to lift them so that belt sits across the collarbone and low on the hips rather than across the neck and tummy.

That simplicity is why the price spread is so confusing. You can pay £50 or you can pay four times that, and all three seats in this guide carry the same R129 i-Size approval for 100-150cm. So what does the extra money actually buy? Having looked closely at three of the best-known boosters at three price points, we found the answer is not "more safety" in any simple sense. It buys specific features that matter to specific families: an ISOFIX connection that keeps an empty seat from becoming a projectile, a fold that makes the seat portable, and a lit buckle that lets an eight-year-old strap themselves in on a dark school morning.

Below we compare the belt-fitted Joie i-Trillo (£50), the folding Cybex Solution G2 (£109) and the Maxi-Cosi Kore Pro i-Size (£210) on the things parents tell us matter after six months of school runs, not just in the shop.

Lil' Bubba's verdicts

• Best Overall: Cybex Solution G2 · 8.5/10 - folds for taxis and holidays, ISOFIX for everyday stability, and a reclining headrest for car naps
• Best for Independent Kids: Maxi-Cosi Kore Pro i-Size · 8.0/10 - the ClickAssist light and open design let children buckle themselves, and it widens as they grow
• Best Value: Joie i-Trillo · 7.5/10 - the lightest seat here at £50, with two cupholders and a guaranteed three-across fit, but belt-only

Quick comparison

Seat	Price	Seat weight	Fitting	Folds?	Standout extra	Rating
Joie i-Trillo	£50	4.4kg	Adult belt only	No	Two tuckaway cupholders, removable side panels
Cybex Solution G2	£109	5.8kg	ISOFIX or belt	Yes, about a third smaller	Reclining headrest, carry handle
Maxi-Cosi Kore Pro i-Size	£210	6.1kg	ISOFIX or belt	No	ClickAssist buckle light, width grows with height

How we picked the 3

We started with every 100-150cm i-Size high-back booster in our catalogue that is in stock with a UK retailer, then narrowed to well-known brands with a sensible spread of price. We left out backless cushions (they give no side or head protection), harnessed toddler-to-booster seats (we covered those separately) and seats with no meaningful independent track record.

For each seat we went through the manufacturer's specifications, retailer listings, published independent European crash-test results and a large pool of parent feedback, looking for patterns rather than one-off rants or raves. Ratings reflect safety features, everyday usability and value at today's prices. Nothing here is sponsored.

What to look for in a high-back booster

i-Size (R129) approval for 100-150cm. All three seats here have it. Under R129 a high-back booster is sized by your child's height, not weight, which makes it far easier to know when to move up. Older R44 "Group 2/3" seats are no longer sold new, and in the UK new backless booster cushions are only approved for children over 125cm and 22kg.

ISOFIX or belt-only. In a booster, the adult seat belt restrains the child either way. ISOFIX connectors add side-to-side stability and, just as importantly, hold the seat in place when nobody is sitting in it, so an empty booster cannot fly forward under hard braking. Belt-only seats need to be buckled in when empty, which is easy to forget.

Headrest and belt guide adjustment. The shoulder belt guide lives in the headrest, so a headrest that moves smoothly with one hand makes it more likely you will actually adjust it as your child grows. Check it sits just above the shoulder.

Width. If you need three seats across the back, or a booster next to a baby seat, width matters more than almost anything else. Side wings that flex or come off help a lot.

Portability. Grandparents' cars, taxis, hire cars and holidays all mean lifting the seat. Weight and whether it folds make a real difference here.

Self-buckling. From about six, most children want to strap themselves in. An open armrest area and a clearly visible buckle make this faster, and help them do it correctly.

1. Joie i-Trillo / 10 · Best Value

The i-Trillo is Joie's entry-level i-Size booster and, at £50, the cheapest seat here by a long way. It fits with the car's three-point belt only (no ISOFIX), weighs just 4.4kg, and covers the full 100-150cm range, roughly from three and a half to twelve years.

Joie has packed in more than the price suggests: a ten-position headrest you can adjust with one hand, colour-coded belt guides, memory foam in the seat cushion, two cupholders that tuck away, and side panels that can be removed to free up space. Joie says three i-Trillos fit side by side in i-Size approved cars until children reach 135cm.

What parents love

• Light and easy to move. At 4.4kg it is the easiest of the three to swap between cars. One parent told us: 'It lives in my car but goes in Grandad's every Friday, and my seven-year-old can carry it himself.'
• Comfort for the money. The memory foam cushion and padded armrests get consistently good feedback. A parent shared: 'No complaints on a three-hour drive, which is more than I can say for the cushion we had before.'
• Three-across friendly. Removable side panels and a guaranteed three-across fit up to 135cm make it a strong pick for families with three children in the back.
• Cupholders included. Both cupholders tuck away when not needed, a small thing children notice every journey.

What to know before you buy

• No ISOFIX. It must be buckled in when empty, otherwise it becomes a loose object in a crash. The ISOFIX version, the i-Trillo FX, costs more.
• Thinner padding than pricier seats. We hear from some parents that the padding feels slimmer than Joie's older Trillo LX and noticeably thinner than the Cybex or Maxi-Cosi.
• Does not fold. Fine for the family car, but bulky for taxis or flights.

Best for

• Families on a tight budget who want a proper high-back seat, not a cushion
• A second seat for grandparents or the childminder
• Cars without ISOFIX points
• Three children across the back seat

2. Cybex Solution G2 / 10 · Best Overall

The Solution G2 is the successor to one of the most highly rated boosters Cybex has made, and in independent European crash testing in 2025 it scored a "good" overall, with a low injury risk in side impacts and very low levels of harmful substances in the fabrics.

Its party trick is the fold. The seat base folds up so the booster takes up roughly a third less space, stands on its own, and has a carry handle. At 5.8kg it is heavier than the Joie, but folded it slides into a boot or overhead space much more easily. It fits with ISOFIX connectors or the adult belt alone, and has a patented headrest that reclines with one hand for sleepy journeys.

What parents love

• Folds for travel. Parents who use taxis, hire cars or fly with children rate the fold above everything else. One parent put it best: 'It's the first booster I've owned that I don't dread carrying through an airport.'
• Recline for naps. The reclining headrest helps stop a sleeping child's head slumping forward out of the side wings, a common complaint with upright boosters.
• ISOFIX stability. The ISOFIX connectors keep the seat stable on corners and in place when empty, and parents find it quick to fit and quick to move.
• Easy, well-made cover. The cover is machine washable and the build quality feels a step up from budget seats.

What to know before you buy

• Wide. Testers and parents both note it is a wide seat. It can be a squeeze three across, though the flexible side wings help.
• Cover removal takes time. Getting the cover off for a wash is more fiddly than on the Joie.
• Frontal results average. Independent testing rated its frontal crash performance as average, against strong side-impact scores. It is still a well-rated seat overall.

Best for

• Families who swap cars, use taxis or travel abroad
• Children who fall asleep on longer journeys
• Parents who want ISOFIX without paying premium prices
• Small boots where a folded seat makes a difference

3. Maxi-Cosi Kore Pro i-Size / 10 · Best for Independent Kids

The Kore Pro i-Size is built around one idea: letting children buckle up by themselves. The armrest area is open, the base narrows near the buckle, and the ClickAssist light switches on automatically when a child sits down, lighting up the buckle in a dark garage or on a winter school morning.

It installs with ISOFIX or the adult belt, weighs about 6.1kg, and the headrest and side wings adjust together so the seat grows in width as well as height. It scored "good" in independent European crash testing, and it has no upper weight limit, so your child moves on when they outgrow it by height.

What parents love

• Children really do buckle themselves. This is the feature parents mention most. One parent told us: 'Every single trip it's "the light is on!" and she's clicked in before I've got the door shut.'
• Grows in width. Height and width adjust together, which helps broader older children stay comfortable through to 150cm.
• Soft, cooler fabrics. The temperature-regulating cover is a noticeable step up on summer journeys and it is machine washable.
• Smooth belt path. Parents report the shoulder belt retracts smoothly through the guide without twisting.

What to know before you buy

• Stiff ISOFIX release. The ISOFIX release buttons are hard to squeeze. We hear repeatedly from parents that removal takes two hands and some effort.
• Battery-powered light. ClickAssist runs on two AA batteries. Maxi-Cosi estimates about four years of use, but it is one more thing to check.
• Pricey and bulky. It is the most expensive seat here, it does not fold, and in some cars it fits better with the vehicle headrest removed.

Best for

• Children of six and over who want to buckle up themselves
• Families who mostly use one car and do not need a fold
• Taller or broader children approaching 150cm
• Dark garages, early starts and winter school runs

What about the Britax Römer KIDFIX?

The Britax Römer KIDFIX i-Size is the other name that comes up constantly, and it is a strong seat with a well-regarded seat belt positioner. We kept this guide to one seat per price point, and at the mid price the Cybex's fold made it the more distinctive pick. If you prefer Britax, the KIDFIX range sits between the Cybex and Maxi-Cosi on price and is worth a look in our catalogue.

How to choose

Joie i-Trillo: choose it if budget comes first, your car has no ISOFIX, or you need a light second seat or three across the back. Just remember to buckle it in when it is empty.

Cybex Solution G2: choose it if you travel, use taxis or swap cars regularly, or your child sleeps in the car. For most families it is the best balance of price, safety features and day-to-day convenience.

Maxi-Cosi Kore Pro i-Size: choose it if your child is ready to buckle up by themselves and you want the easiest seat for them to use every day, and you do not need it to fold.

Add it to your Nest

Planning the next stage? Add your favourite booster to your free BubsNest registry so family can chip in, and browse more car seat comparisons in our community guides.