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Britax Poplar Convertible Car Seat, 2-in-1 Car vs Maxi-Cosi Romi 2-in-1 Convertible Car Seat, Infant

Updated August 2026 — Britax Poplar Convertible Car Seat, 2-in-1 Car wins on max forward-faci and max rear-facing, Maxi-Cosi Romi 2-in-1 Convertible Car Seat, Infant wins on width.

The Britax Poplar offers advanced safety features and a customizable fit, while the Maxi-Cosi Romi is a budget-friendly, lightweight option. Choose based on your priorities.

Why Britax Poplar Convertible Car Seat, 2-in-1 Car is better

Safety Features

Britax has a carbon steel frame and SafeCell crumple zone.

Adjustability

Britax offers a 14-position headrest and harness.

Space Efficiency

Britax's slim design fits 3-across in many vehicles.

Why Maxi-Cosi Romi 2-in-1 Convertible Car Seat, Infant is better

Price

Maxi-Cosi is significantly cheaper at $149.99.

Weight

Maxi-Cosi is one of the lightest car seats available.

Eco-Friendly

Maxi-Cosi uses 100%-recycled EcoCare fabric.

Overall score

Britax Poplar Convertible Car Seat, 2-in-1 Car
85
Maxi-Cosi Romi 2-in-1 Convertible Car Seat, Infant
70

Specifications

SpecBritax Poplar Convertible Car Seat, 2-in-1 CarMaxi-Cosi Romi 2-in-1 Convertible Car Seat, Infant
InstallationClickTight1-click LATCH
FabricFlame-retardantEcoCare
Safety RatingHigherStandard
Comfort Features14-position headrestPureCosi fabrics
Travel-FriendlyModerateHigh

Dimension comparison

Britax Poplar Convertible Car Seat, 2-in-1 CarMaxi-Cosi Romi 2-in-1 Convertible Car Seat, Infant

Price Comparison

The Britax Poplar Convertible Car Seat is priced at $329.99, while the Maxi-Cosi Romi 2-in-1 Convertible Car Seat is significantly cheaper at $149.99. This means the Britax is about 120% more expensive than the Maxi-Cosi. If budget is a primary concern, the Romi presents a much more economical choice without sacrificing essential safety features. Given that both products are designed for the same age group and usage, the price difference can be a significant factor for families looking to balance quality and affordability.

Design and Size

In terms of design, the Britax Poplar features a slim 17-inch profile, making it particularly well-suited for fitting three car seats across in many vehicles. This SpaceSaver design allows families to maximize seating options without compromising safety. On the other hand, the Maxi-Cosi Romi is designed to be lightweight, weighing just over 9 lbs, making it one of the lightest convertible car seats available. While the Romi focuses on portability, the Britax emphasizes a compact design that fits snugly in various car configurations, appealing to families with multiple children.

Safety Features

Safety is paramount in car seats, and both the Britax Poplar and the Maxi-Cosi Romi come equipped with essential features. The Britax Poplar boasts a carbon steel frame and patented SafeCell crumple zone, which enhance crash energy management. It also includes a patented V-shaped tether for added stability. Conversely, the Maxi-Cosi Romi meets federal safety standards and includes side impact protection. While both seats are designed with safety in mind, the Britax's more extensive safety features may provide additional peace of mind for parents, especially for those prioritizing advanced safety technologies.

Comfort and Cleanability

When it comes to comfort, the Britax Poplar includes a 14-position quick-adjust headrest and harness, allowing for a perfect fit as your child grows. Its naturally flame-retardant fabrics are machine washable, making it easy to keep clean. The Maxi-Cosi Romi features PureCosi fabrics which are soft and breathable, designed without added fire retardant treatments, making them better for both your child and the environment. Both car seats offer machine-washable covers, but the Britax provides a more customizable fit with its adjustable headrest and harness system, which may be particularly beneficial for growing children.

Ease of Installation

Installation is a critical factor in car seat safety, and both products offer user-friendly features. The Britax Poplar employs ClickTight technology, which allows for a straightforward installation process with clearly labeled seat belt paths and an automatic tensioner for easy tightening. In contrast, the Maxi-Cosi Romi uses a 1-click LATCH system that simplifies the installation process, especially for caregivers who may frequently move the car seat between vehicles. While both systems are effective, the Britax's ClickTight technology may provide an edge in ensuring a secure fit with minimal hassle.

Portability

For families who travel frequently or need to switch car seats between vehicles, the portability of a car seat is crucial. The Maxi-Cosi Romi excels in this area due to its lightweight design, making it easy to carry and transport. Its unique carrying strap feature allows parents to effortlessly move the car seat hands-free. The Britax Poplar, while still manageable, is heavier and may not be as convenient for parents on the go. Therefore, for families prioritizing ease of transport, the Maxi-Cosi Romi is the clear winner.

Age and Weight Limits

Both car seats cater to a wide range of ages and sizes, but there are differences in weight limits. The Britax Poplar accommodates children in a rear-facing position up to 50 lbs and switches to forward-facing for children up to 65 lbs. The Maxi-Cosi Romi, on the other hand, supports rear-facing up to 40 lbs and forward-facing up to 50 lbs. If you are looking for a car seat that will accommodate your child for a longer period in the rear-facing position, the Britax Poplar may be the preferable choice.

Which should you buy?

Deciding between the Britax Poplar and the Maxi-Cosi Romi ultimately depends on your specific needs and priorities. If budget is a major concern, the Maxi-Cosi Romi stands out as a lightweight, travel-friendly option at $149.99, offering essential safety features and comfort. However, if you are willing to invest more for advanced safety technologies, a customizable fit, and a compact design suitable for multiple children, the Britax Poplar at $329.99 might be worth the splurge. Both seats are reputable choices in the convertible car seat category, but your decision should align with your family’s lifestyle and budget.