MARATHON

FIT CHART
Seated shoulder height Weight Height
Rearward Facing
Seated Shoulder Height: 9 - 16.75 in.
Weight: 5 - 40 lbs.
Height: 0 - 49 in.
9 - 16.75 in. 5 - 40 lbs. 0 - 49 in.
Forward Facing
Seated Shoulder Height: 12 - 16.75 in.
Weight: 20 - 65 lbs.
Height: 0 - 49 in.
12 - 16.75 in. 20 - 65 lbs. 0 - 49 in.

MARATHON


AWARDS


The Marathon is a high-performing seat with an adjustable fit, making it a solid choice for your child from the #1 brand in safety technology.

  • Safeguards your child with side impact protection, an impact-absorbing base and steel frame
  • Safely installs with easy-on/off lower anchors
  • Easily adjusts with the push of a button – no need to rethread the harness
  • Includes car seat and removable pillow

MARATHON

The Marathon is a high-performing seat with an adjustable fit, making it a solid choice for your child from the #1 brand in safety technology.

  • Safeguards your child with side impact protection, an impact-absorbing base and steel frame
  • Safely installs with easy-on/off lower anchors
  • Easily adjusts with the push of a button – no need to rethread the harness
  • Includes car seat and removable pillow
FIT CHART
Seated shoulder height Weight Height
Rearward Facing
Seated Shoulder Height: 9 - 16.75 in.
Weight: 5 - 40 lbs.
Height: 0 - 49 in.
9 - 16.75 in. 5 - 40 lbs. 0 - 49 in.
Forward Facing
Seated Shoulder Height: 12 - 16.75 in.
Weight: 20 - 65 lbs.
Height: 0 - 49 in.
12 - 16.75 in. 20 - 65 lbs. 0 - 49 in.

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This product is not available to purchase from the Britax website
MSRP $289.99

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This model is available in a variety of exclusive retailer offerings
Select an option to view color options as well as MSRP

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SafeCell Impact Protection: Superior Protection, Only from Britax

Britax is the only child car seat brand that features world-class SafeCell Impact Protection. This integrated system of safety components provides unmatched protection for your child. These features include a steel frame, energy-absorbing base, V-shaped tether to minimize seat rotation and staged-release stitches that slow and reduce forward movement during a crash.

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Side Impact Protection

Side impacts represent 25 percent of collisions. In fact, it’s these accidents that result in the most severe injuries. We designed the Marathon with these statistics in mind. The seat has a deep foam-lined shell to absorb energy and shield your child from side impacts.

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Safe and Easy Installation

At Britax, we make it easy on you to achieve a safe installation. The Marathon’s easy-on/off lower anchors quickly lock onto your vehicle’s anchors and disconnect with the push of a button.

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Maximum Fit and Comfort

We developed the Marathon to provide a safe and comfortable fit as your child gets bigger. The easy-adjust harness grows along with your child with 10 different positions. Change the height of the seat with just the push of a button – no inconvenient rethreading necessary.

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ALL PRODUCT FEATURES

SUPERIOR PROTECTION

  • Side impact protection formed by a deep foam-lined shell.
  • Impact-absorbing base compresses to reduce the rough force of a collision.
  • Impact-stabilizing steel frame offers superior strength where you need it most: at the connection point to the vehicle.
  • V-shaped tether minimizes seat rotation with a unique two-strap design.
  • Britax-patented staged-release stitches slow the seat’s forward movement during a crash. 
  • Impact-absorbing harness pads adsorb energy and reduce your child’s forward movement during an impact.
  • Proudly engineered, tested and made in the USA with global components for top safety and quality.

 SMART DESIGN

  • Easy-buckle system keeps buckles and straps out of your way when positioning your child.
  • Easy-remove cover pulls free of the car seat for cleaning without having to remove the harness.

 SAFE AND EASY INSTALLATION

  • On/off lower anchors lock into place with a click and easily release with a push of a button.
  • 3-position recline makes for easy angle adjustment.

 MAXIMUM FIT AND COMFORT

  • No-rethread 10-position harness quickly adjusts with the push of a button as your child grows.
  • Quick-adjust 2-position buckle easily moves outward as your child gets bigger.
  • Removable body pillow adds comfort and can be removed when your child outgrows it.
  • Plush foam padding and fabrics for premium comfort.
FULL SPECIFICATIONS
Child Weight - Rear Facing 5 - 40 lbs
Child Weight - Forward Facing 1 year and 20, up to 65 lbs
Child Standing Height 49" or less
Child Seated Shoulder Height - Rear Facing 9 - 16.75"
Child Seated Shoulder Height - Forward Facing 12 - 16.75"
Product Weight 19.5 lbs
Product Dimensions 18.5" W x 26" H x 21" D
Seat Area Depth / Width 11" / 11"
Shoulder Width 13"
Harness Slot Heights 8.5" / 9.5" / 10.5" / 11.5" / 12.5" / 13.5" / 14.5" / 15.5" / 16.5" / 17.5"
Buckle Strap Depths 5" / 7.5"

Marathon is rated 4.627450980392157 out of 5 by 306.
Rated 5 out of 5 by from 1st Convertible car seat success! This was our first convertible car seat for our first daughter. We got it for her when she was around 20 months. She needed to stay rear facing for a little longer because she was not 20#s at the time we purchased it. It worked really well and our daughter was very excited and pleased with her new seat! It was so easy to install and to switch back and forth to either of our vehicles when needed. This car seat is everything it said it would be and more! We just recently purchased 2 of the Boulevard seats for both our daughters since we do more traveling now (we moved and have more traveling to do now) and this seat will be our spare for grandparents. A person can't go wrong with a Britax car seat....we never plan to use anything but these seats! Thanks Britax!!! :)
Date published: 2016-07-11
Rated 5 out of 5 by from Sturdy construction, quality materials! This is our 2nd Britax seat for our third child. What an amazing product! Was easy to set up in our vehicle(s) in a variety of different securing situations (Lucas anchors/seatbelt). I was impressed with its construction and the materials used. Our newborn sat safely inside with minimal adjustments (baby is 3 days old at time of writing this). I would recommend this product to any nervous parent who wants the safest product for your dollar.
Date published: 2016-07-09
Rated 5 out of 5 by from Simply the best I bought 3 different Britax car seats. The Marathon Roundabout, Marathon Click Tight and the Boulevard Click Tight. The Roundabout was the cheaper of the 3 by $90 but was lighter and easier to adjust. I found that the 2 Click a tight models would not loosen all the way, and yesterday my fatherinlaw complained it was too tight for my daughter.
Date published: 2016-06-29
Rated 5 out of 5 by from easy to install! We purchased our Marathon a little over a month ago. We were extremely impressed with how easy it was to install and how well it fit into our vehicles. We are very impressed with this car seat and we would highly recommend it.
Date published: 2016-06-13
Rated 5 out of 5 by from Gorgeous seat We are delighted with the fit and ease this carseat provides. My daughter was closer to 8 months when we put her in an advocate, so seeing my newborn son in this seat is amusing, but I know I can trust its quality and safety.
Date published: 2016-06-13
  • 2016-07-28T06:47CST
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