BRITAX RÖMER EVOLVAFIX I-SIZE CAR SEAT
20000379BREVFR129
Britax Römer EvolvaFix i-Size, car seat Group 1-2-3 with ISOFIX, offers optimal safety and comfort from 15 months to 12 years. It complies with the R129 i-Size regulation, ensuring superior protection.
KNGKRPSC
- BRITAX RÖMER EVOLVAFIX I-SIZE CAR SEAT
- KNEEGUARD FOOTREST FOR CAR SEATS (KNGKRPSC)
804916
- BRITAX RÖMER EVOLVAFIX I-SIZE CAR SEAT
- AXKID CONNECT PAD WITH INTEGRATED SAFETY SENSOR (804916)
Britax Römer EvolvaFix i-Size Car Seat (76–150 cm)
15 months to approx. 10–12 years · Group 1-2-3 · ISOFIX + Top Tether · 5-point harness up to 105 cm (22 kg) · SecureGuard · EasyRecline · FLIP&GROW
Who is the Britax Römer EvolvaFix i-Size for?
The Britax Römer EvolvaFix i-Size is a combined Group 1-2-3 car seat designed for families who want a long-lasting, safe and comfortable solution from 15 months up to around 10–12 years. Approved to the UN R129 i-Size standard, it converts from a seat with an integrated 5-point harness to a high-back booster in just a few steps, supporting your child’s growth for years.
It is ideal if you want a forward-facing seat with ISOFIX installation, everyday-use features, a practical recline for longer trips, and an extra layer of protection thanks to SecureGuard.
Overall view
Details and finishes
Use and configuration
Main features
UN R129 i-Size standard
Approved to i-Size, providing up-to-date safety performance designed to support protection throughout childhood.
Group 1-2-3: 76–150 cm
Built to protect from 15 months to around 12 years (76–150 cm). A versatile long-term solution that grows with your child.
5-point harness up to 105 cm (22 kg)
Children can benefit from the added stability of a 5-point harness for longer, up to 105 cm and a maximum of 22 kg.
i-Size safety for every stage
EvolvaFix i-Size protects your child from 15 months until they no longer need a car seat, combining a high-back booster structure, belt guides and safety elements designed for frontal and side impacts.
SecureGuard
SecureGuard adds a fourth contact point to the 3-point seat belt to help keep the lap section in a more suitable position over your child’s pelvic bones. It can reduce abdominal forces in a frontal collision by up to 35 percent according to internal testing.
V-shaped headrest
Designed to help control head movement and enhance side-impact protection. It supports the head and neck and adapts as your child grows.
High-back booster protection
The shell provides protection from head to hips, especially in side impacts. Upper and lower belt guides help keep the vehicle belt correctly positioned in booster mode.
Flexibility at your fingertips
With FLIP&GROW, switching from the integrated 5-point harness to the vehicle’s 3-point seat belt is simple as your child grows. There is no need to remove parts from the seat, as the harness can be stored in the backrest to prevent losing it, and SecureGuard is set up for the next stage.
EasyRecline lets you recline the seat into comfortable positions without having to refit the installation. You can even adjust it while your child is seated, making it easier for them to rest on longer journeys.
EasyRecline
Choose a more relaxed angle without reinstalling. Perfect for real-world naps and long trips.
FLIP&GROW
A guided transition from the harness to the vehicle seat belt when your child reaches 100 cm, up to 105 cm or 22 kg.
Soft premium chest pads
They improve comfort and help reduce movement in a collision. They can be removed for washing without uninstalling the harness.
Installation and usage stages
EvolvaFix i-Size is designed for forward-facing travel and provides a stable set-up using ISOFIX with Top Tether during the 5-point harness stage.
Stage with 5-point harness
Up to 105 cm (max. 22 kg) your child uses the 5-point harness. Installation: ISOFIX with Top Tether for a quick, secure fit, reduced installation mistakes and added stability.
Stage with the vehicle seat belt
From 100 cm, your child is secured using the vehicle’s 3-point seat belt. The seat can be used with seat belt and ISOFIX, or with seat belt only, depending on your needs and your car’s compatibility.
V-shaped Top Tether
Top Tether helps minimise rotation and can reduce potential head and neck load in an accident. The V-shaped design provides additional stability compared to conventional Top Tether systems.
Technical specifications · Britax Römer EvolvaFix i-Size
| Standard | UN R129 i-Size |
| Usage range | 15 months to approx. 12 years · 76–150 cm |
| Orientation | Forward-facing |
| 5-point harness | Up to 105 cm (max. 22 kg) |
| Harness to belt transition | FLIP&GROW, simple change from 100 cm (up to 105 cm or 22 kg) |
| Recline | EasyRecline, comfortable positions without refitting |
| Installation up to 105 cm | ISOFIX with Top Tether |
| From 100 cm | With seat belt and ISOFIX or with seat belt |
| Safety | SecureGuard, belt guides, V-shaped headrest |
| Comfort | Breathable fabrics, chest pads, ergonomic design |
Comparison of our combined car seats
Find the perfect model for you and your child (15 months to 12 years). On desktop it shows as a table, and on mobile it becomes easy-to-read cards.
| Model | Usage | Install with 5-point harness up to 105 cm | From 100 cm | Collections | Safety | Comfort |
|---|---|---|---|---|---|---|
|
Britax ADVANSAFIX PRO Warm Caramel
|
15 months – 12 years
76 – 150 cm |
ISOFIX with Top Tether
|
With seat belt + ISOFIX
or with seat belt |
CLASSIC, STYLE, LUX
|
SecureGuard ✔ XP-PAD ✔ SICT ✔
|
EasyRecline ✔ FLIP&GROW ✔ Extra-soft insert ✔ Mesh fabric: STYLE only Sustainable fabrics: LUX only
|
|
Britax VERSAFIX Space Black
|
15 months – 12 years
76 – 150 cm |
ISOFIX with Top Tether
|
With seat belt + ISOFIX
or with seat belt |
—
|
SecureGuard ✔ XP-PAD — SICT —
|
EasyRecline ✔ FLIP&GROW ✔ Extra-soft insert — Mesh fabric — Sustainable fabrics —
|
|
Britax EVOLVAFIX Dusty Rose
|
15 months – 12 years
76 – 150 cm |
ISOFIX with Top Tether
|
With seat belt + ISOFIX
or with seat belt |
—
|
SecureGuard ✔ XP-PAD — SICT —
|
EasyRecline ✔ FLIP&GROW ✔ Extra-soft insert — Mesh fabric — Sustainable fabrics —
|
Technologies that matter in real life
SecureGuard is included in ADVANSAFIX PRO, VERSAFIX and EVOLVAFIX. It adds a fourth contact point to help keep the lap belt correctly positioned over the pelvis, reducing abdominal forces in a frontal collision by up to 35 percent according to internal data.
XP-PAD is available on ADVANSAFIX PRO. In a frontal impact it can reduce sudden forward head movement by up to 30 percent according to internal data, helping to protect the neck and chest.
SICT is available on ADVANSAFIX PRO. Its side-impact absorption technology can reduce the force of a side impact by up to 40 percent according to internal data, bringing protection closer to the vehicle side and directing forces away from your child.
EasyRecline and FLIP&GROW are present on all three models. EasyRecline allows recline adjustment without refitting, even with your child seated. FLIP&GROW simplifies the switch from the integrated harness to the vehicle seat belt when your child reaches 100 cm (up to 105 cm or 22 kg).
Frequently asked questions
How long can my child use the 5-point harness on EvolvaFix i-Size?
The 5-point harness can be used up to 105 cm (maximum 22 kg). After that, you switch to the vehicle seat belt stage, guided by FLIP&GROW.
When do I switch to the vehicle 3-point seat belt?
The change is done when your child reaches 100 cm, up to a maximum of 105 cm or 22 kg, depending on growth. FLIP&GROW is designed to keep the process simple and tidy.
How is it installed during the harness stage?
Up to 105 cm, installation is done with ISOFIX and Top Tether. This combination improves stability and helps reduce common mistakes.
Can I recline it without reinstalling?
Yes. EasyRecline lets you adjust the recline without refitting the installation, even with your child seated.
What does SecureGuard add?
It adds a fourth contact point to help keep the lap belt over the pelvis. According to internal data, it can reduce abdominal forces in a frontal collision by up to 35 percent.
Is it suitable for long journeys?
If you want a long-term combined seat, EvolvaFix i-Size supports comfort with EasyRecline, breathable fabrics, a V-shaped headrest and growth-friendly adjustment over the years.
Why buy from algateckids?
At algateckids, we have a long tradition in child car safety, both online and in-store. That means expert guidance to help you choose correctly, plus real support before and after your purchase.
Final tip
The Britax Römer EvolvaFix i-Size is a very complete combined seat if you want one solution from 15 months to 12 years, with stable installation, longer 5-point harness use, an easy transition to the vehicle seat belt and extra reassurance from SecureGuard. If your priority is a no-fuss seat that grows with your child while maintaining strong protection, it is a highly recommended choice.
