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SKU #: BRX1422

Britax Marathon G4 Convertible Car Seat


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Britax Marathon G4 Convertible Car Seat

The BRITAX MARATHON™ convertible car seat is designed for children rear facing from 5 to 40 pounds and forward facing from 20 up to 65 pounds. The MARATHON achieves revolutionary head safety through the use of BRITAX SafeCell Technology® in the base, integrated steel bars, and energy absorbing Versa-Tether® that work together to minimize head excursion and reduce the risk of head injury during a frontal impact. The MARATHON also incorporates BRITAX Side Impact Protection, offers a no-rethread and quick-adjust five-point harness, multiple buckle and recline adjustments, and an easy-remove cover that also allows access to belt paths from the front of the seat. A head and infant pillow is provided for extra comfort and infant positioning.


  • Base with SafeCell Technology® features SafeCells designed to compress in a crash, significantly lowering the center of gravity and counteracting the forward rotation of the child seat which normally propels the child toward the front seat
  • Integrated steel bars strengthen the connection to the vehicle and reduce forward flexing of the child seat during a crash
  • Energy absorbing Versa-Tether® features a staged-release tether webbing to slow the forward movement, reducing the crash forces reaching the child, and a two-point attachment to minimize forward rotation while anchoring the top of the child seat
  • Tangle-free, five-point harness distributes crash forces across the strongest parts of the body and provides a secure fit
  • Two buckle positions for your growing child
  • Infant positioning pillow offers extra comfort while achieving proper harness fit for small infants
  • Premium lower latch connectors for a quick and simple installation featuring a push button for easy release
  • Built-in lock-offs ensure a snug lap and shoulder belt installation with minimal effort
  • Anti-slip, contoured base grips and protects the vehicle seat while offering optimum vehicle fit
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  • Overall Height - Top to Bottom: 26"
  • Overall Width - Side to Side: 18.5"
  • Overall Depth - Front to Back: 21"
  • Overall Product Weight: 19.5lbs

Britax Marathon G4 Convertible Car Seat

Additional Documents


Weights & Dimensions

  • 26'' H x 18.5'' W x 21'' D, 19.5 lbs
  • Overall Height - Top to Bottom: 26"
  • Overall Width - Side to Side: 18.5"
  • Overall Depth - Front to Back: 21"
  • Overall Product Weight: 19.5lbs


Product Type: Convertible car seatColor: Multi Colored
Removable Seat Cushion: YesCountry of Manufacture: United States

About the Manufacturer

Peace of Mind. That's why families around the world have chosen Britax for more than 30 years. They know that Britax's safety, engineering, and experience have made it the best-selling child seat in England, Europe, and Australia. Consumers and retailers know when it comes to child seat safety and innovation, Britax continues to be the world leader.

Today, American parents are discovering the features, safety, and style built into every Britax child seat and booster seat. Introduced in America only ten years ago, Britax seats have already developed a strong following among moms and dads, grandparents and top-end auto makers like Porsche and Mercedes Benz who appreciate Britax quality and flair for style.

Britax Marathon G4 Convertible Car Seat

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When you buy a Britax Marathon G4 Convertible Car Seat online from Wayfair, we make it as easy as possible for you to find out when your product will be delivered. You can check on a delivery estimate for the Britax Part #: E9LQ91A here. If you have any questions about your purchase or any other Car Seats product for sale our customer service representatives are available to help.Whether you just want to buy a Britax Marathon G4 Convertible Car Seat or shop for your entire home, Wayfair has a zillion things home.

Britax Marathon G4 Convertible Car Seat

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Return Policy

We want you to love it. If you don't, you may return your purchase within 30 days of delivery. All you need to do is visit our Self-Service Return Center for instructions. Return credits are issued within 24 hours once the item is received and inspected. Please note that shipping charges are non-refundable. The cost of return shipping will be deducted from your refund.

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Customer Reviews

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Average Overall Rating:
(based on 8 reviews)

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Great car seat

 from New York, NY– Verified Buyer

This was a present for my son's new baby, they love it.

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Great Car seat

 from Arlington, VA– Verified Buyer

Our son loves this car seat and he is one who does not like to be in a car seat for very long. It is very heavy, though, so I wouldn't recommend it for a travel seat. It seems to be very comfortable and has plenty of room for him. We have the kiwi color which we like because then it doesn't get so hot.

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For my daughter

 from Elyria, OH– Verified Buyer

Easy to install and very comfortable. She seems to like it.

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Great car seat

 from Houston, TX– Verified Buyer

Really comfortable car seat kids love it will recomend to other

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love this!!

 from Indialantic, FL– Verified Buyer

absolutely love the pattern and the car seat! so easy to install

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 from long beach, NY– Verified Buyer– Top 500 Reviewer

Good item to have it is a nice add to any home

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 from Texas– Verified Buyer

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 from California– Verified Buyer

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Marathon G4 Convertible Car Seat is also sometimes listed under the following manufacturer numbers: E9LQ91A, E9LQ91Q, E9LQ93G, E9LQ95K