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Britax Britax Marathon 70

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  • 5-70 lb. weight capacity
  • Convertible; can be installed rear-facing or forward-facing
  • Excellent Side Impact Protection with energy absorbing EPP foam

About the Britax Marathon 70

For most parents, choosing Britax is an easy decision. Choosing which Britax Car Seat is best for your child is another matter entirely. The Britax Marathon 70 is a convertible seat that accommodates babies weighing 5 to 40 pounds in the rear-facing position, and children from 1 year old and weighing 20 to 70 pounds in a forward-facing position.

 

The Britax Marathon 70 is a convertible car seat that will last most children from birth until they are ready to move into a booster seat. The Quick-Adjust harness straps allow you to easily adjust the height of the shoulder straps without having to uninstall the car seat. The deep side walls of the Marathon 70 provide side-impact protection around your child's head and body.

 

Some of the noteworthy safety features on the Britax Marathon 70 include the patented Versa-Tether™, built-in lock-offs, LATCH system connectors, and energy-absorbing EPP foam. The  5-point harness has four different shoulder heights that adjust at the back of the seat. A button in front allows you to fine tune the straps' snugness, depending if your child is wearing a bulky coat on a short ride to school, or just their PJs for an overnight trip.

 

Britax Marathon 70 Specs

Manufacturer:
Britax
Other Weight Capacity Info:
5-40 lb. (rear-facing), 20-70 lb. (forward-facing)
Max Height Capacity (in.):
49"
Additional Side Impact Protection:
Yes
5-Point Harness:
Yes
Dimensions:
19.5"L x 18.5"W x 26"H
Weight (when empty):
18 lb.
Manufacturer's Product Number:
Onyx: E9LB11A, Crimson: E9LB11D, Waverly: E9LB11H, Cowmooflage: E9LB11Q, Blueprint: E9LB12D, Allison: E9LB12U
Care Instructions:
Hand wash cover with cold water and mild soap. Line dry.
Made in the USA:
Yes

Features and Benefits

Premium push-button LATCH connectors

Allow for a quick, simple and tight installation of your Britax Marathon 70

Patented Versa-Tether™

Anchors the top of your Britax Marathon 70 to provide stability and minimize movement in a crash

Rear- or Forward-facing tethering

Increases seat stabilization any time you use your Britax Marathon 70

Rear- and Forward-facing recline

Allows for child comfort and positioning in the Britax Marathon 70

Energy-managing EPP foam

Absorbs energy in the event of a crash

Easy-adjust mechanism for harness fit

Ensures a consistently snug harness fit when your child rides in the Britax Marathon 70

Convenient belt holders

Keep harness straps to the sides while you're placing your child in the Britax Marathon 70

Anti-slip contoured car seat base

Allows the Britax Marathon 70 to fit perfectly in most vehicles

70-pound weight capacity

Allows most children to use the Britax Marathon 70 until they are ready for a booster seat

Plush, easily removable seat cover with matching comfort pads and infant body pillow

Offers comfort and support for smaller babies, and allows you to easily remove the cover of your Marathon 70 for cleaning without uninstalling the car seat

(5)
4.4 out of 5.0 stars
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5 Customer Reviews for:

Britax Marathon 70

5 user reviews.
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Britax Marathon 70
Kate
Rockland, Ma
  • Verified Reviewer
  • First Time Parent
5.0 stars out of 5.0 stars

safety

Pros:

Easy to install, Comfortable, Safe, Sturdy, Easy to Adjust

Bought it for the safety

Yes, I would recommend this to a friend.
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Britax Marathon 70
Hydrak
Natick, MA
  • Verified Reviewer
  • First Time Parent
4.0 stars out of 5.0 stars

Great transition car seat

Pros:

Easy to install, Comfortable, Stylish, Sturdy, Safe

Cons:

Difficult release button

We were ready to make the transition and lose the bucket, but we didn't know what to do next. Our baby still needs to be rear facing and we want to keep her that way for as long as possible. This car seat is beautiful and very roomy. The people at Magic Beans are really helpful and know a lot about car seat safety. I highly recommend this car seat!

Yes, I would recommend this to a friend.
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Britax Marathon 70
SafeT1st
Ramstein, Germany
  • First Time Parent
5.0 stars out of 5.0 stars

Awesomeness!

Pros:

Stylish, Easy to install, Easy to Adjust, Easy to Clean, Sturdy, Safe

This seat is awesome! My son loves it and it is easy to install. I love the different levels of recline. It's easy to adjust and when installed properly is very safe. My only complaint is that I wish the seat was a little deeper to allow more leg room for the older toddler that is still rear facing. :)

Yes, I would recommend this to a friend.
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Britax Marathon 70
lindseylou
nantucket
  • Verified Reviewer
  • First Time Parent
4.0 stars out of 5.0 stars

it fits in a honda fit!!!

Pros:

Sturdy, Safe, Comfortable, Easy to install, Lightweight

Cons:

Doesn't recline

i was bummed when my 8 month old outgrew her Chicco keyfit 30 (which we LOVED and hoped would last a year), so after way too much online research looking for the next seat i originally ordered the sunshine kids radian xtsl but had to return it due to its awkward fit (it's really tall) in my little honda fit as well as its extreme weight and bulk (i could hardly carry it out to the car much less through an airport, or down a plane aisle--it's that heavy), so i was DELIGHTED when i went into the magicbeans store and found that the Britax marathon 70 fits perfectly in my car [...] fyi, the boulevard is the same size so that fits too). the carseat fits both rear and forward facing in either the middle or passenger side of the back seat, with the front passenger seat only 1/4 of the way up (more legroom up there now than with the Chicco!). it's light enough to lug it around, is surprisingly compact, and is SUPER easy to install and reinstall in other cars (the versa-tether was the only confusing aspect and there is a video on the Britax website to help with that).

Yes, I would recommend this to a friend.
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Britax Marathon 70
Amy, mom to Ella, 16 months
Boston, MA
  • Verified Reviewer
  • Verified Owner
  • First Time Parent
4.0 stars out of 5.0 stars

Great Car seat!

Pros:

Stylish, Sturdy, Comfortable, Safe, Easy to install

Cons:

Heavy

I love this car seat because it is easy to install (less than a minute). Even though my daughter is 16 months, we still have her rear-facing and my daughter seems very comfortable in the seat. The only problem we have had so far is moving the seat from one car to another...it is pretty heavy. But, since we only have one car, it isn't that often that we have to move it.

Yes, I would recommend this to a friend.
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Videos for Britax Marathon 70

Click to view a video that explains the details behind the design and safety engineering of Britax Car Seats.

Download Manuals for the Britax Marathon 70

  1. Click to download the user guide for the Britax Marathon 70  Convertible Car Seat. This manual provides important information about car seat installation, safety guidelines, and how to get the most out of your Britax Marathon 70.

    Download Size: 10.51MB
    Est. download time:
    • DSL: 1min 14sec
    • Cable: 37sec
    • Format: PDF
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