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

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

FABRIC COLOR:

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.

Shop with our Online Retailers
FIND A RETAILER

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

Purchase now from the following online retailers:


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

Babies"R"Us Ultimate Comfort Series

buy buy Baby XE Series

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.

Learn more
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.

Learn more
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.

Learn more
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.

Learn More
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 4.6108 out of 5 by 203.
Rated 5 out of 5 by from Excellent car seat This car seat was a replacement to the one I lost when my car was totaled. I like it even better than my previous one. It is perfect for my 8 month old and I know I'll be able to use it for many years.
Date published: 2015-06-22
Rated 5 out of 5 by from Great Seat We like it a lot...the rest of this post is so that it has enough characters
Date published: 2015-06-21
Rated 4 out of 5 by from Seat does not Move Needed a seat that my 18 mo. old could not get out of and fit in my car. this seat has been perfect.
Date published: 2015-06-16
Rated 5 out of 5 by from Great Fit for Tall Toddler We purchased the Britax Marathon XE from Buy Buy Baby because it was the perfect seat for us. Our toddler is tall and her legs are endless! I went into Buy Buy Baby with my mind set on another car seat but I left the store with this one.I like the fact that she is protected from all sides and she's comfortable for long road trips. The only drawback is that if you put it in the middle of your back seat, which I had to do, you do not have a lot of space on either side for someone to sit comfortably beside her.We like our Britax and more importantly, she does too!
Date published: 2015-06-12
Rated 5 out of 5 by from Awesome Seat We were in a very bad accident last week. The car was totaled, my four month old slept through the wreck in her Marathon. She didn't have a single mark on her. I would definitely recommend the Marathon from newborn and up. We of course ordered a new Britax seat!
Date published: 2015-06-11
Rated 5 out of 5 by from So easy to use is very friendly to use and very complete and also safe!!
Date published: 2015-06-07
Rated 5 out of 5 by from Great seat! I purchased two of these car seats three years ago, and they have survived two boys! I am incredibly happy with both car seats and if there's ever been any issue with either of them I have called and have been assisted with exemplary customer service who fixed my needs immediately. My one son used the carseat until he was 4.5 years old and nearly 40lbs. The only reason we decided to move him to a new seat was to use the seat for our other son. I highly recommend this car seat as well as all Britax products!
Date published: 2015-06-05
Rated 5 out of 5 by from easy to install I am very pleased with this carseat. My daughter loves it!
Date published: 2015-06-03
  • 2015-07-23T06:56CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.5
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_203
  • loc_en_US, sid_Marathon-01-N, PRD, sort_mostRecent
  • clientName_britax
RELATED PRODUCTS