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Product Information

Britax Marathon G4 Convertible Car Seat - Onyx
[Download an Information Sheet. Click here. Please note that this feature may not be supported on mobile platforms.]

The Britax 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.

Features:

  • Base with SafeCell Technology 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
  • Side Impact Protection with energy-absorbing EPP foam distributes crash forces, shields from vehicle intrusion, and contains the head, neck and body
  • Premium Lower LATCH Connectors for a quick and simple installation featuring a push button for easy release
  • Certified for Aircraft Travel
  • Includes car seat base

Manufacturer Recommended Weight/Height Limits:

  • Rear Facing: 5 to 40 pounds
  • Forward Facing: 20 to 65 pounds
  • Up to 46 inches

Product Dimensions:

  • Width/Height/Depth: 18.5 x 26 x 21 inches
  • Weight: 19.5 pounds

Learn More: Visit the Britax shop! Click here. Please note that this feature may not be supported on mobile platforms.

• Made in the USA
• 100% Polyester

Product Notes

Popularity: #3 in Car Seats
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Britax Marathon G4 Convertible Car Seat - Onyx

11 reviews
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List Price: $289.99
$232.00
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Customer Reviews & Product Info

REVIEW SNAPSHOT®

by PowerReviews
 
4.7

(based on 3 reviews)

100%

of respondents would recommend this to a friend.

Pros

  • Attractive (3)
  • Comfortable (3)
  • Durable (3)

Cons

    Best Uses

    • Infants (3)
    • Toddler (3)

    Reviewed by 3 customers

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    Displaying reviews 1-3

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    5.0

    The BEST Carseat Ever!!!

    By Scott's Mom

    from Norwalk, CT

    About Me Parent of Two or More Children

    See all my reviews

    Pros

    • Attractive Design
    • Comfortable
    • Easy to Assemble
    • Sturdy

    Cons

      Best Uses

      • Infants
      • Toddlers

      I was looking for a convertible carseat for my 9 month old who was getting uncomfortable in his bucket carrier seat. The car seat I was going to order was out of stock and I didn't want to wait. I ordered this one and it was the best decision I could have made. It took no time at all to install it, the instructions were so easy to follow. My son LOVES it, it's cushy and the cushions on the straps are so easy to adjust and move to wear you want them. I would absolutely recommend this to a friend!

      Comment on this review

       
      5.0

      Love it!

      By Mila's Mommy

      from Temecula

      About Me First Time Parent

      Pros

      • Attractive Design
      • Comfortable
      • Compact
      • Easy to Assemble
      • Sturdy

      Cons

        Best Uses

        • Infants
        • Newborn
        • Toddlers

        I love this car seat! It took me a while to decide between this one and a Graco but I am so glad I went with the Britax. It was super easy to install and the recline and hight adjusters are so convinient. The Britax is very good quality and very safe. It has versa tethers and steel bars.. The Graco one we looked at seemed flimsy and didn't offer much support. All plastic... The infant support pillow it came with is super soft and comfy. The cover is also easily removed so it can be washed. Best purchase I've made. I also loved that thanks to Diapers.com we had free shipping and it arrived the next day. How awesome is that?!

        Comment on this review

         
        4.0

        I like this carseat

        By Social Worker Mommy

        from Denver, CO

        About Me Parent of Two or More Children

        Pros

        • Attractive Design
        • Comfortable
        • Easy to install
        • Sturdy

        Cons

        • Fabric

        Best Uses

        • Infants
        • Toddlers

        I am a huge Britax fan, mostly because of ease of use and installation. This one fit the bill. I have a Boulevard for my son but this Marathon was a great deal, and I honestly can't tell the difference. As always, it was easily installed with the LATCH system.
        My 14 month old is very happy in it. If I had only one complaint (although, it's not really a huge deal) the fabric on this seat is not a soft fabric, it's more like a stroller fabric which is easy to clean/wipe (big plus) but first thing in the morning it's pretty cold to the touch. This will likely be nice in the summer. The pattern is beautiful and I'm definitely happy with this purchase.

        Comment on this review

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