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Britax Marathon vs Boulevard (2021): Which Is The Better Convertible Car Seat?

A car seat is a must-buy especially if you’re going to be driving around with your child in tow. If you’re a practical parent driver, you’ll probably go for a convertible car seat that your child can use for years. The Britax Marathon and the Britax Boulevard always make it to the list of convertible car seats that have good quality and high safety ratings. Now the question is, which between the two is the better convertible car seat for your child? Read on to find out.

Britax Marathon vs Boulevard Comparison Chart

ModelBritax MarathonBritax Boulevard
Rear-Facing InstallationYes; 2 with comfort pillowYes; 2 with comfort pillow
Forward-Facing InstallationYesYes
Weight Capacity5 – 65 lbs (2.3 – 29.4 kg)5 – 65 lbs (2.3 – 29.4 kg)
Layers of Side Protection12
Quick Adjust Headrest1414
Recline Positions77
Steel FrameYesYes
LATCH/LUAS ConnectorsYesYes
Dimensions23″ x 18.5″ x 23.5″ (30.25″ height with headrest fully extended)23″ x 18.5″ x 23.5″ (30.25″ height with headrest fully extended)
Weight28.5 lbs (12.92 kg)29.4 lbs (13.33 kg)
Colors Available68

Britax Marathon and Boulevard Design

These Britax convertible car seats have similar dimensions and build.

Britax Marathon and Britax Boulevard similarities in design
The Britax Marathon (left) and Britax Boulevard (right) have the same dimensions but differ slightly in weight.

When you look at the Britax Marathon and Britax Boulevard, you’ll most probably see no difference at all in terms of design. It’s not surprising really because they are both from the Britax ClickTight Infant/Child Car Seat series. Both car seats can also be used by a child of up to 40 lbs when in rear-facing mode and up to 65 lbs when in front-facing mode.

Probably, one slight difference is the Boulevard’s additional layer of side impact protection. As a result, it is heavier by almost a pound. It also has two additional color/pattern options compared to the Marathon.

Britax Convertible Car Seat Special Features

Britax is an innovative car seat brand and has loaded these two models with special features as well.

Britax Convertible Car Seat Special Features
Britax ClickTight Infant/Child Car Seat Series special features.

The Britax Marathon and Boulevard have the same special features since both belong to the Britax ClickTight convertible car seat line:

  • 7-Position, Quick Push Recline and Easy-Read Level Indicators – Easily find the correct angle for your car and gives the most comfort for your child.
  • 14-Position Quick-Adjust Harnness and Headrest – Only one hand needed to adjust the headrest and harness as your child grows. No re-threading necessary.
  • Flip Forward Buckle – The buckle stays out of the way as you board or lift your child.

Britax Marathon and Boulevard Safety Technology

Britax has its own special technology to ensure child passenger safety.

Britax Marathon and Boulevard Safety Features
Britax convertible car seat safety features can be found in both the Marathon and the Boulevard.

Britax is one of the baby gear companies committed to child passenger safety. In fact, the Britax Marathon and Britax Boulevard scored 4-5 stars in all categories of the National Highway Traffic Safety Administration (NHTSA) evaluation test.

Britax Marathon and Boulevard car seats provide full body protection making sure that its premium foam (2 layers for the Boulevard) surrounds the child’s head, neck, and torso. The car seat is made of high strength steel that keeps it stabilized. In adddition, Britax’s patented v-shaped tether has staged-release stitches that slows down forward movements in case of full stops or crashes. Lastly, the car seats have SafeCell Technology which is a part of the seat base that crumples to absorb crash energy.

Britax Car Seats Installation & Fitment

Britax’s ClickTight Installation feature makes installation as easy as 1-2-3.

Britax ClickTight Installation
Only 3 steps needed to secure the Britax Marathon and Boulevard in your car.

Britax has this patented ClickTight Installation System that makes installation a breeze. All you’ll have to do is to push the ClickTight dial in the center to lift the lower part of the car seat. Then, pull the seat belt, thread it in, and buckle it. Last step is to return the lower part to its original position until it clicks. That’s it!

Britax also guarantees that it’s not only easy, but tight and stable as well. So rest assured that it won’t be a wiggly ride for your little one on the Britax Marathon or Boulevard.


Britax Marathon vs Boulevard? You choice will depend on your budget.

The Britax Marathon costs a few bucks less than the Boulevard. These two Britax car seats have the same safety features and only the additional layer of protection sets the Boulevard on a higher level. If you’re alright with just having the standard layer of side impact protection for your child, then, the Marathon is a good choice. But if you’re willing to go all the way for your little one, by all means, buy the Boulevard!

On the other hand, if you’re looking for a Britax convertible car seat that can accommodate a child weighing up to 120 lbs (54.43 kg), you may want to check out the Britax One4Life instead.


๐Ÿ“Œ Is Britax a trusted carseat brand?

Britax has been in the child passenger safety industry since 1966. Though it is a Canadian company, all of their products are tested and built in the United States with U.S. & Global Parts.

๐Ÿ“Œ Do these Britax car seats have an expiry date?

Britax car seats are recommended for use for up to 10 years. Using an expired car seat will mean compromising your child’s safety.

๐Ÿ“Œ Why is it called a convertible car seat?

A convertible car seat is one that can be easily converted from being a rear-facing infant car seat to a forward-facing toddler seat as you child grows.

๐Ÿ“Œ What is a LATCH or LUAS?

LATCH is an acronym for Lower Anchors and Tethers for Children. Your car should have LATCH anchors where you can connect your cars seat’s straps. In Canada, it is called LUAS which stands for Lower Universal Anchorage System.

Last update on 2022-06-30 / Affiliate links / Images from Amazon Product Advertising API

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Mauie Flores

Senior Editor at Compare Before Buying, blogger and content creator passionate about writing, music, and good food.