Maxi-Cosi Romi 2-in-1 Convertible Car Seat, Infant vs Safety 1st EverSlim 4-in-1 Convertible Car Seat,
Updated August 2026 — Safety 1st EverSlim 4-in-1 Convertible Car Seat, leads on max weight and width.
The Maxi-Cosi Romi offers a lightweight and eco-friendly option, while the Safety 1st EverSlim provides greater versatility and safety features. Choose based on your family's needs.
Why Maxi-Cosi Romi 2-in-1 Convertible Car Seat, Infant is better
Price
Romi is $80 cheaper than EverSlim
Weight
Romi weighs just over 9 lbs
Eco-friendly
Romi uses 100% recycled fabric
Why Safety 1st EverSlim 4-in-1 Convertible Car Seat, is better
Versatility
EverSlim has 4 modes of use
Space Efficiency
EverSlim fits 3 across most back seats
Safety Features
EverSlim has SecureTech chest clip
Overall score
Specifications
| Spec | Maxi-Cosi Romi 2-in-1 Convertible Car Seat, Infant | Safety 1st EverSlim 4-in-1 Convertible Car Seat, |
|---|---|---|
| Modes | 2-in-1 | 4-in-1 |
| Fabric | EcoCare | Memory Foam |
| Installation | LATCH | Adjustable Base |
| Cup Holders | 1 | 2 |
| Safety Standard | Yes | Yes |
Dimension comparison
Price Comparison
When it comes to price, the Maxi-Cosi Romi 2-in-1 Convertible Car Seat is about 35% cheaper than the Safety 1st EverSlim 4-in-1 Convertible Car Seat. The Romi is priced at $149.99, while the EverSlim costs $229.99. This significant price difference may play a crucial role for budget-conscious parents looking for a reliable car seat. While the Romi offers a solid combination of features at a lower price, the EverSlim provides additional versatility, which could justify its higher cost for some families.
Weight and Portability
The Maxi-Cosi Romi is designed to be remarkably lightweight, weighing just over 9 pounds. This makes it one of the lightest convertible car seats available, perfect for families who need to move the car seat between vehicles or travel frequently. In contrast, the Safety 1st EverSlim is heavier, reflecting its more complex design that accommodates four modes of use. The Romi's lightweight nature, combined with features like the convenient carrying strap, makes it an ideal choice for parents who prioritize portability and ease of travel.
Design and Comfort
In terms of design and comfort, both car seats offer unique features that cater to different parenting needs. The Maxi-Cosi Romi boasts EcoCare fabric made from 100% recycled materials, which is soft and breathable, ensuring comfort for your child. Its PureCosi fabrics are designed without added fire retardant treatments, making it a safer option for your little one. On the other hand, the Safety 1st EverSlim includes memory foam cushioning, enhancing comfort for longer rides. Both designs focus on child comfort, but the Romi's eco-friendly materials may appeal to environmentally conscious parents.
Safety Features
Safety is paramount when choosing a car seat, and both products meet federal safety standards. The Maxi-Cosi Romi features an adjustable harness and a top tether that enhances safety during travel. The EverSlim stands out with its SecureTech chest clip, which provides a visual indicator to ensure that the clip is securely fastened. While both car seats prioritize safety, the EverSlim’s additional features for securing the child could offer peace of mind for parents who are particularly safety-oriented.
Versatility and Usage
The Safety 1st EverSlim offers four modes of use, making it a versatile choice that can accommodate children from birth to 10 years old. It transitions from a rear-facing car seat to a forward-facing seat, and then to both a belt-positioning booster and a backless booster, covering a weight range from 5 to 100 pounds. In contrast, the Maxi-Cosi Romi serves as a 2-in-1 seat, suitable for children weighing between 5 to 50 pounds. For families looking for a single car seat that grows with their child, the EverSlim's versatility may be a critical advantage.
Ease of Cleaning
Both car seats are designed with ease of maintenance in mind. The Maxi-Cosi Romi features removable, machine-washable fabrics, making it easy to clean after spills or accidents. Similarly, the Safety 1st EverSlim also has a removable seat cover that is machine-washable and dryer-safe. This focus on convenience is essential for busy parents. However, the Romi's lightweight design combined with its easy-to-clean fabric may give it a slight edge for those who frequently need to tidy up after their little ones.
Space Efficiency
In terms of space efficiency, the Safety 1st EverSlim excels with its ultra-slim design that measures just 17.3 inches across without the cup holders. This allows for three of these car seats to fit across most back seats comfortably, making it an ideal choice for families with multiple children. In contrast, the Maxi-Cosi Romi does not specifically advertise its width, but its lightweight construction suggests it is also designed for easy fitting in vehicles. For families needing to maximize space in their vehicles, the EverSlim’s slim profile is a significant advantage.
Which should you buy?
Ultimately, the choice between the Maxi-Cosi Romi 2-in-1 Convertible Car Seat and the Safety 1st EverSlim 4-in-1 Convertible Car Seat depends on your family's specific needs and budget. If you are looking for a lightweight, eco-friendly option that is easy to travel with, the Romi offers great value at $149.99. However, if you want a car seat that grows with your child through multiple stages and offers enhanced safety features, the EverSlim, priced at $229.99, may be worth the investment. Both car seats have their strengths, making them excellent options depending on your family's priorities.

