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 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.