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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Target Plus Package

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 4.5804 out of 5 by 224.
Rated 5 out of 5 by from Favorite carseat We have been using two Britax Roundabout carseats since our oldest daughter was born in 2009. Sadly, after two more children, those seats have expired. With our fourth child on the way the decision to replace the expired seats with another Britax was easy. After a lot of research I chose to purchase the Marathon as opposed to the Roundabout this time. I'm so glad I did. I thought my Roundabout was easy to use. The Marathon was SO simple to install, takes up even less space in the car, and is much more comfortable for our 2 1/2 year old son. I can easily adjust the straps to accommodate my four and six year old daughters as well. They are all fighting to sit in this new carseat. I only wish I could have purchased two more! I can not say enough good things about this seat. If you are hesitating about purchasing this carseat, don't. It's well worth the money, and will last you for many years to come.
Date published: 2016-04-11
Rated 5 out of 5 by from The harness adjustment is even easier than the last from 10 years ago! Love it!! We just used it for the first time the other day, for an infant 12 lbs. It was so easy to install and put him in, and get him out. For us older moms and dads starting overagain, Thank you for the help.
Date published: 2016-03-27
Rated 5 out of 5 by from Comfortable ,safe ride I bought this seat about 3 months ago, and we love it. My daughter is much more comfortable in it than she was on the bucket seat. The roll bars make me feel like she is extra safe. Relatively easy to install , still in rear facing for a while. Very happy with this purchase.
Date published: 2016-03-09
Rated 5 out of 5 by from Easy to install I actually have two of these, one for my 3 year old and one for my infant son. So easy to install and tighten using the LATCH system. So easy to clean as well, my daughter threw up in hers a couple times and all the fabric comes off without issue. Easy to switch from rf to ff. Not too expensive if you find a good sale.
Date published: 2016-03-05
Rated 5 out of 5 by from Great features, easy to clean, comfortable I've been been very pleased with both of my britax carseats. However, one of the covers was not wearing very well so I called customer service to see if I could order a replacement. They took my information and said "okay, that will ship out tomorrow and arrive in 2-5 business days." No charge. Just like that! I could not be more pleased!
Date published: 2016-02-23
  • 2016-05-26T06:29CST
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