We love Evenflo car seats because of their affordable prices and excellent safety features. We got the chance to test the Evenflo Sonus  and were highly impressed not only by its performance, but with its versatility. 

This convertible car seat can accommodate children from 5-65 pounds and 19-50 inches. It’s not a complete convertible car seat, but for the price, it does what it’s supposed to do until you no longer need it. It’s FFA regulated, meaning you can use it on airplanes and has been tested by all side-impact standards to ensure your child stays safe. 

We appreciate the built-in ventilation that makes the car seat comfortable and cool for your child. It also has two cup holders for snacks and drinks, but they can’t be used in the rear-facing position. If anything were to get spilled on the seat, the cover can be removed and thrown in the washer and dryer. 

We found that the 5-point harness system can be easily adjusted as well. It accommodates the growth of developing children easily and conveniently. Furthermore, you can fit three of these in the backseat of your vehicle. 

We enjoyed testing the Evenflo Sonus 65. We like the double cup holders, machine washable cover, and price. Unfortunately, there is no infant insert pillow and it takes up quite a bit of passenger legroom when installed rear-facing.

In this detailed review, we look into the top features, pros, and cons. Finally, we will compare it to 3 other popular convertible car seats. 

Top Features

Structurally Sound

The Evenflo Sonus is a safe convertible seat having been tested for structural integrity. It has exceeded all side-impact measures and has even been rollover tested.

Having been tested by all side-impact standards, this seat is made to keep your child safe from collision. The Evenflo Sonus  is also certified by the FAA to be used on airplanes.

Built-in Ventilation 

It’s designed to be comfortable and durable, with two cup holders and a built-in ventilation system for airflow. This should keep your kids cool during summer. It also has a five-position harness that can be readily adjusted from the front for a perfect fit. The Sonus 65 would fit children from 5 to 65 pounds.

Made to be lightweight at 11 pounds, you surely wouldn’t get stressed when you need to switch cars. Note, the reason for this is because it is built of plastic and not high-end steel components.  The latched connector on the Sonus 65 is the regular hook style clips that connect to your vehicle. It has a white button that you can push down to easily free the strap.

Evenflo Sonus

  • Designed and examined for structural integrity at energy levels
  • The side impact was examined for impact  and exceeds federal safety standards
  • Extended rear-facing keeps children safe
  • Fits 3-across in a lot of vehicles
  • Up-front harness adjustable for simple, snug fit from the front
  • Can convert from rear-facing to forward-facing
  • It has 5-shoulder strap positions for accurate fit for developing children
  • Wider seat base comfortably fits a broader range of child sizes
  • The air-flow ventilation system provides air circulation and greater comfort for children
  • Double cupholders
  • The seat pad can be machine washed and tumble-dried
  • It has free video support for expert aid with installation


  • Rear-facing weight range 5-40 lbs
  • Rear-facing height range 19-50 in.
  • Two top harness slots 
  • Forward-facing weight range 22-65 lbs 
  • Forward-facing age minimum 2 years
  • Forward-facing height range 28-50 in.
  • Highest harness slot 17 in.
  • Lowest harness slot 6 in.
  • 6 harness slots 6, 8.5, 10.5, 12.5, 15, and 18 in.

Evenflo Sonus Convertible Car Seat, Charcoal Sky

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as of January 27, 2023 6:07 pm


  • VERSATILE: The Sonus Convertible Car Seat helps protect rear facing infants from 5-40 pounds, and forward facing toddlers from 22-50 pounds, extending the life and use of this full-featured car seat. Rear facing height is 19-40 inches and forward facing height is 28-50 inches
  • TESTED AND TRUSTED: In addition to meeting or exceeding all applicable federal safety standards, this car seat also passes Evenflo's comprehensive Side Impact and industry leading Rollover Test Standards
  • ALL-SEASON COMFORT: The Sonus features a revolutionary air flow ventilation system that provides a temperature-regulated, comfortable traveling experience regardless of the season or your climate. Rear facing fit tip- Top of head is at 1 inch below the top of the child restraint seat back
  • TRAVEL WITH FREEDOM: This restraint meets FAA Inversion requirements for airplane use allowing it to serve as a seat that can travel with you during family vacations or holidays around the world
  • OTHER VALUABLE FEATURES: Up-front adjustment for easy access to harness, 5 shoulder strap positions for proper fit, removable pads for easy machine washing, 2 cup holders, and head pillow for support


  • Weight  10.8 lbs
  • Width at widest point 18 in.
  • Seat pan depth 12 in.
  • Crotch buckle 2 slots, 3.5 and 5 inches from the back. 
  • Shell height 25 in.

What we like

  • It has been rollover and impact tested.
  • The convertible car seat is durable.
  • The airflow vent keeps your child ventilated.
  • The narrow width allows you to fit 3-across in many vehicles
  • You can adjust the harness from the front. 
  • They come with free video support
  • They’ve been approved by the FAA for airplane travel

What we don’t like

  • It has just one recline angle in rear-facing installations
  • They take up a lot of passenger legroom in rear-facing installations 
  • It does not come with an infant insert pillow
  • The cupholders can’t be used in rear-facing installations

Evenflo Sonus  vs. Evenflo Stratos 65

The Evenflo Sonus and Evenflo Stratos 65 are affordable convertible car seats from Evenflo. They share a lot more in common than differences.

They can both function in a rear-facing and forward-facing mode for 5-40 lbs infant. They both can bear kids that weigh up to 65 pounds.

Also, both of Evenflo Stratos 65 and Evenflo Sonus  has been tested by Federal Crash Test and rollover standard test. These verified the car seats to be entirely secure for your kids. As a plus, Evenflo Stratos 65 is sealed with E3 Side impact protection. This would help your kids in the event of a side collision. 

Furthermore, the two seats are temperature monitored and come with multiple shoulder strap positions. But, the Stratos 65 has an addition of a 5-position adjustable headrest. That allows you to propel the headrest to the height of your kids. 

We have seen how similar they both are, but how are they different? Well, the Stratos 65 is regarded as a higher version of the Sonus 65. Their value range differs by a few dollars. So, if you are on shrunken funds you could work with the Evenflo Stratos 65.

However, let’s check out their distinctive specifications with the table below.


Stratos 65

Sonus 65

Rear-Facing Weight5-40 lbs5-40 lbs
Forward-Facing Weight22-65 lbs22-65 lbs
Side Impact TestedYesYes
Federal Crash TestedYesYes
Rollover TestedYesYes
E3 Side Impact ProtectionYesNo
Safe InstallationYesNo
Air Flow Ventilation SystemYesYes
Adjustable Headrest5 PositionsNo
Shoulder Positions65
Up-Front AdjustYesYes
Cup HoldersDualDual
Machine Washable PadsYesYes

Evenflo Sonus vs. Cosco Scenera

The Cosco Scenera is assuredly a notably lightweight seat compared to the Sonus 65. The Cosco Scenera weighs about 7 pounds, while the Sonus 65 is close to 11 pounds. With this kind of weight, it would be no bother to carry the Scenera on your car seat backpack. 

Also, the Evenflo Sonus has a weight limit stretching up to 65 pounds, while the Scenera stops at 40 pounds. So, your kids can use this seat till they are two years, but you don’t get that with the scenera. The scenera would require a booster to fit or you might just have to get a new seat for your child.

The Scenera is installed using a latch installment system, so as the Sonus 65. This might seem like a good choice but what happens when your car doesn’t come with a latch? It means you can only use these seats with cars that have a latch lock. Notwithstanding, the latch installment system is still safer for your kids. 

The Evenflo Sonus 65 promises your kids comfort as it is properly padded with a headrest. Well, if you get yourself a Scenera, you wouldn’t be having these options. Some kids find it stiff for use in long distances.

Evenflo Sonus  Vs Graco Contender

Evenflo Sonus 65The Graco contender is a convertible seat just like your Evenflo Sonus 65. However, while the Sonus 65 is designed with a feature that protects you from a side collision, the Graco gives you something else.

They are built with energy-absorbing foam to help your kids in the event of a crash. 

The Evenflo Sonus and the Graco Contender can both be used in a rear-facing position for kids that weigh 5 to 40 pounds. But then in a forward-facing position, it can take babies that weigh up to 65 pounds.  

If you want a bit more of height for your little one, you can opt for the Graco contender. It has a harness slot of 18 inches but the Sonus  is measured at 17 inches. The Graco however, doesn’t have an adjustable headrest, but the Sonus 65 can be adjusted up to 28 inches.

Finally, when it comes to pricing the Graco is way more expensive than the Evenflo Sonus. Evenflo gives you great quality at a friendly price. But in all, they all guarantee your comfort. 

Evenflo Sonus Vs Britax Marathon G4

The Britax Marathon G4 convertible seat is all good but the Evenflo Sonus has a critical tipping edge. The Sonus has a built-in airflow vent that keeps your kids comfortable during your ride.  

They also have varying measurements. The harness slot of the Britax marathon G4 is measured at 16 inches while the Sonus 65 is at 17 inches. Here, with the Evenflo Sonus, you get more flexibility in terms of height.

There are other highlights that the Marathon G4 has that isn’t available in the Sonus 65. One of which is the premium lower anchor connectors. This would help to connect the seat to your vehicle without necessitating a seat belt. This often ensures your child is securely settled for the ride.

Ultimately, the Britax Marathon G4 has an anti-rebound feature that helps to guard against the tension of a crash. Additionally, checks any forward movements. This lets your kids stay seated even in the event of a collision. The Evenflo Sonus 65 and the Britax Marathon G4 are both exceptional seats. Yet, what matters is what design you think you should align with.  

Final Verdict

The Evenflo Sonus is that convertible seat that provides for your little one till they rise to weigh 65 pounds. It was designed to keep your child safe still when you are involved in a collision. The seat braces your child and checks any unnecessary forward movement. 

The Sonus  is that seat I’ll prescribe for you if you require something to keep your child comfortable. The ventilation features constantly get the kids cool enough during the ride. You don’t have to fret about summer heat with this seat. You may be interested in the Evenflo EveryFit 4-in-1 Review


Welcome to my car seat blog! As a mom of 3, I put together with other hard-working moms a highly informative one-stop car seat resource, full with many reviews and buyer guides. I hope you find it invaluable. Thank you for trusting me & my team! - Keren

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