Britax Römer
Advansafix Pro
8/10 overall£259.00
A forward-facing Group 1/2/3 seat that converts from a 5-point harness to a highback booster, built around Britax's side-impact and pelvis-protection systems.
The verdict
The Britax Römer Advansafix Pro is a forward-facing Group 1/2/3 seat (76-150cm) that converts via its FLIP&GROW mechanism from a 5-point harness to a highback booster, with SICT side-impact and XP-PAD protection. It's best for children who've already been rear-facing as an infant and are ready for a conventional harness-to-booster seat installed on Isofix with a top tether.
The Advansafix Pro is Britax Römer's core forward-facing seat for once a child is ready to face forward, covering 76-150cm (roughly 15 months to 12 years) on Isofix with a top tether, or Isofix plus the vehicle's own seatbelt for older, taller children. Its FLIP&GROW mechanism switches the seat from a 5-point harness to a highback booster with the vehicle seatbelt as the child grows, and it carries Britax's SICT side-impact and XP-PAD deceleration pad protection.
Against the Cybex Pallas G3 in this list, the two are closely matched forward-facing rivals at a similar price: the Britax leans on a conventional harness-to-booster conversion with strong side-impact hardware, while the Cybex uses an impact shield (a fold-down pad the child sits behind rather than a harness) which Cybex markets as reducing neck injury risk in a frontal crash. Neither is an extended rear-facing seat, so if you want a child to keep facing backwards past toddlerhood, look at the Movekid or Stretch² instead - both of these are strictly forward-facing options for after that stage.
It's best for parents who've already had their child rear-facing as an infant and are ready to move to a conventional forward-facing harness seat with a straightforward Isofix fit. The one real limitation is that it's forward-facing only - it doesn't offer the extended rear-facing option some safety advocates recommend for as long as possible, so it's a seat for the next stage rather than a like-for-like alternative to the ERF seats above.
Is the Advansafix Pro worth it?
- Converts from harnessed seat to highback booster as the child grows
- SICT and XP-PAD side-impact hardware is a genuine step up from basic boosters
- Isofix and top tether fitting for a snug, consistent install
What are the downsides of the Advansafix Pro?
- Forward-facing only - no extended rear-facing option
- Bulkier shell than slimmer boosters once in the booster stage
- Full specification/pricing details are thin on Britax's own UK site
Specs
- Installation
- Isofix + top tether, or Isofix + vehicle seatbelt
- Suitable from
- Approx. 15 months to 12 years (76-150cm)
- Safety standard
- UN R129 (i-Size)
- Facing direction
- Forward-facing only
- Recline positions
- 3-position Easy Recline backrest adjustment
- Key safety features
- SICT side-impact protection, XP-PAD, SecureGuard, FLIP&GROW harness-to-booster conversion
How we scored it
Safety & Fit
Crash protection design (side-impact systems, impact shields, or extended rear-facing capability), how securely and correctly the seat installs, and how well it accommodates a growing child without needing to be replaced too soon.
Ease of Installation & Everyday Use
How straightforward the seat is to install correctly (Isofix vs seatbelt-only, clear indicators), and how easy it is to adjust, clean, and move between cars day to day.
Isofix plus top tether gives a consistent, easy install
Value for Money
What the seat delivers - years of use, safety features, and build quality - relative to its UK retail price.
Weighted by importance for this category — see our editorial policy for how we test.
How this review was done
We haven't used the Advansafix Pro ourselves yet. This review is built from Britax Römer's published specifications and product information, and scored the same way as everything else on the site. We'll update it, and the badge above, once we've tested it hands-on.
How it compares
|  |  |  | |
|---|---|---|---|---|
| Price | £259.00 | £479.00 | £180.00 | £295.00 |
| Overall score | 8/10 | 8.1/10 | 8.8/10 | 7.9/10 |
| Installation | Isofix + top tether, or Isofix + vehicle seatbelt | Vehicle seatbelt only (no Isofix required) | Isofix with support leg (harness stages); Isofix or seatbelt (booster stage) | Vehicle seatbelt + top tether (no Isofix) |
| Suitable from | Approx. 15 months to 12 years (76-150cm) | Approx. 6 months to 7 years (61-125cm, up to 36kg) | Birth to approx. 12 years (40-145cm, up to 36kg) | Approx. 7 months to 7 years (61-125cm, up to 36kg) |
| Safety standard | UN R129 (i-Size) | Swedish Plus Test certified; ADAC score 1.2 (top-rated to age 7) | UN R129/03 (i-Size) | UN R129 (i-Size), Swedish Plus tested to 125cm |
Frequently asked questions
Does the Advansafix Pro offer rear-facing use?+
No — it's forward-facing only, covering roughly 15 months to 12 years (76-150cm), so it doesn't offer the extended rear-facing option some safety advocates recommend.
How does it grow with my child?+
Its FLIP&GROW mechanism switches the seat from a 5-point harness to a highback booster using the vehicle seatbelt as the child grows.
What safety features does it have?+
It carries Britax's SICT side-impact protection and XP-PAD deceleration pad, along with SecureGuard, which the brand describes as a genuine step up from basic boosters.
How does it install?+
Isofix with a top tether, or Isofix plus the vehicle's own seatbelt for older, taller children, giving a snug, consistent install.
How does it compare with the Cybex Pallas G3?+
The two are closely matched forward-facing rivals at a similar price — the Britax uses a conventional harness-to-booster conversion with strong side-impact hardware, while the Cybex uses a fold-down impact shield instead of a harness.
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Reviewed by
Sepehr
Software engineer, soon-to-be dad, uncle to four — the tech-obsessed half of the two of us testing this stuff. Currently building this site with my wife, ahead of our own baby arriving.