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Britax Marathon convertible car seat

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Our Review of the Britax Marathon convertible car seat

Select Fashions on Sale for $249.99! Regularly priced at $279.99. Save $30 (10%)

Click here to view a demo of Britax Side-Impact Protection

  • Britax has just implemented a new, patent-pending, energy absorbing rip-stitch tether for all Marathon convertible car seats.

Increasing the time a child can safely stay in their convertible car seat is a big issue and Britax engineers have come through in a big way with the introduction of the Britax Marathon with LATCH. A LATCH Compatible Convertible Child Seat, the Britax Marathon can be used rear facing 5 to 33 pounds and forward facing from 20 to 65 pounds. Compare the numbers and you will see it is hard to find a seat with these weight limits that is safe and functional.

The Britax Marathon is built on a shell with dimensions that are larger than the Britax Roundabout. Even with the larger dimensions, the Marathon is still approved for use on aircraft and will fit perfectly in just about every car out there. (Rear-facing installation may be more tricky. If intended for rear-facing use, please allow for 31" of back seat space)

Some standout features include a four-position adjustable shoulder straps that are easy to change as your child grows, easy to install IsoFit™ LATCH buckles, easy to adjust recline system, and floating HUGS that enable easy chest clip placement and distributes the harness load to avoid webbing edge irritation to a child's neck in the event of a crash.

Trying to decide between the Britax Marathon and Britax Decathlon?
The Britax Decathlon is identical in many ways to the Marathon. Updated features on the Decathlon include:

  • 3-position adjustable crotch strap
  • Removable toddler head pillow and infant positioning system for newborn babies

If you are looking for your baby's first car seat, the additional padding on the Decathlon will be an attractive feature. Or, if you're searching for a second seat for your child who continues to come up at the top of the growth chart, the Decathalon's adjustable crotch strap might come in handy as he or she grows even more. If these are not in your list of concerns, then the Marathon should work great.

*Please note: Use vehicle seat belt (not LATCH connectors) for installations with children weighing more than 48 pounds (21 kg.). Refer to the vehicle's owner's manual or contact the vehicle manufacturer for the maximum weight rating for their LATCH anchors. Unless specified otherwise by the vehicle manufacturer, assume a 48 pound child is the vehicle LATCH anchor limit.

Authorized Britax Dealer
Britax maintains an authorized dealer network which protects you from buying used, illegally imported, or fake Britax Car Seats. In addition, Britax warranty only covers car seats purchased from an authorized retailer. Britax products purchased on eBay or any auction site voids the warranty.
  • Britax Marathon in Ashley Floral
    Ashley Floral
  • Britax Marathon convertible car seat - Brooke
    Brooke
  • Britax Marathon in Cowmooflage
    Cowmooflage
  • Britax Marathon
    Crocodile
  • Granite
    Granite
  • Britax Marathon convertible seat
    Mariposa
  • Britax Marathon
    New Denim
  • Onyx
    Onyx
  • Britax Marathon
    Tan Swirl
Britax Marathon
Click here to download instruction manual. (Adobe Reader required)

Car seat specs

Min child weight
5 lbs.
Max child weight
65 lbs.
Rear-facing minimum weight
5 lbs.
Max child weight - Rear Facing mode
33 lbs.
Min child weight - Forward Facing mode
20 lbs.
Max child weight - Forward facing mode
65 lbs.
Max harness weight capacity
65 lbs.
Min child height
18"
Max child height
49"
Min child height - Forward facing mode
18"
Max 5-pt harness child height capacity
49"

Car seat dimensions

Product weight
17.5 lbs.
Seat Base / Foot Width
19.5"
Seat height
28"
Interior seat width
11"
Interior seat back height
22.5"
Bottom to lowest harness slot
10"
Bottom to highest harness slot
17.5"
  • Easy Recline Adjustment Handle provides a range of comfortable seating and reclining positions
  • Britax Patented Versa-Tether™ secures the seat from tilting forward or backward in the event of an impact in both the forward and rear facing positions.
  • Five-Point Harness with four adjustable shoulder heights for a secure fit as your child grows
  • One Pull Harness Strap Adjuster for quick, easy, and snug fit every time
  • IsoFit™ Flexible Buckle System for LATCH, ensuring a simple and secure fit
  • Removable, hand-washable cover.
  • Floating HUGS (Harness Ultra-Guard System) enables easy chest clip placement and distributes the harness load to avoid webbing edge irritation to a child's neck in the event of a crash
  • Built in Lock-Offs, both forward facing and rear facing, are designed for easy reach and operation when using traditional belt routing
  • Approved for use in aircraft
  • Product dimensions: 28"H x 19.5"W x 25"D, 17.5 lbs.

Britax Marathon convertible car seat Reviews

Britax Marathon convertible car seat

All Customer Reviews

Average Rating:
Star Rating
Highest Rating:
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Lowest Rating:
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Number of Reviews:
146
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Submit A Review
Showing 1 to 9 of 146

Love it!

5
Reviewer: Anonymous , Canton, OH Date: January 01, 2009
I purchased the Britax Marathon carseat for my daughter 5 years ago and she still sits in it at age 5 and 40 lbs. My son is 2 1/2 and of course he had to have a matching one with the cowmooflage cover. The car seat sits higher than other car seats and they look safe and comfortable as well. We drove to Myrtle Beach from Ohio twice in these car seats and the kids slept the whole way without complaints. Definitely highly recommeded and five stars!
0 of 0 people found this review helpful
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very happy

5
Reviewer: B , Tampa, FL Date: December 22, 2008
Great Carseat, roomy and comfortable for baby. Only downside, if you have a Nissan Murano the strap to secure the seat goes directly across the back of the trunk space and interferes with the storage space. Not sure how this works in other SUV/crossovers
0 of 0 people found this review helpful
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would definatly recommend

4
Reviewer: MamaJ , PA, PA Date: December 16, 2008
I have been using this carseat for about 2 months now and LOVE it! The print is really nice and my 10 mo 22lb Daughter seems very comphortable. Installed rear facing it is a little wobbly but with some modifications from my hubby we fixed that (all other seats seem to have the same issue too) I love the fact that my daughter will be able to use it rear facing longer due to the higher weight ratings and we don't have any trouble with the crotch buckle as some others have mentioned. I would give it 5 stars but it is on the difficult side to take the cover off and wash, and also that it wobbles rear facing. All in all though it is a little expensive but a great, safe car seat and I do recomend!
0 of 0 people found this review helpful
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Britax Marathon Car Seat

5
Reviewer: Michelle , Huntsville, TX Date: November 21, 2008
I love the Britax Marathon Convertible Car Seat. My 8 month old was around 20 pounds and 29 inches long so he was reaching the upper threshold for his infant car seat. Also he hated his infant seat because he was too scrunched up in it so I purchased the Britax Marathon Convertible Car Seat after reading muliple reviews all praising this car seat and seeing how well it was rated for safety in Consumer Reports. The fabric on this car seat is really soft velour (I got the croccodile print) and padded much more than my son's infant car seat was. He has alot more room in this seat and it sits higher up so he can see out the window. I like that it can be rear facing until my son is one year old and then it can be forward facing. It is also nice to have the velcro on the sides to hold the straps while trying to put my son in the seat. With his infant seat I was always having to dig the straps out from underneath him and that just added to his frustration with being in such an uncomfortable seat. Overall this is a great seat that I hope to get many years of use out of.
2 of 2 people found this review helpful
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awesome carseat!!!

5
Reviewer: Amanda , phx, az Date: November 01, 2008
I couldnt ask for anything better!!!!!Everytime we have to go somewhere my daughter enjoys getting in "her seat"...
0 of 0 people found this review helpful
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Wonderful seat, very safe

5
Reviewer: Savvy's Mommy , Temecula, CA Date: September 02, 2008
I read reviews here before buying this seat. A little pricey, but worth it. No exposed foam like the Graco seat. You have to look -under- the seat cover for the latches, which threw me at first. I have no problem with the belts twisting as some reviewers did. My younger sister did when she buckled my daughter in. Pay attention and it won't happen. I have 7 siblings and remember many carseats. This is the nicest I've seen or used.
1 of 1 people found this review helpful
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Great seat IF your car has child restraint latches

4
Reviewer: Emily , Plymouth, MN Date: August 21, 2008
Don't get me wrong, we love this seat. It's durable, my son appears to be super comfortable in it and it's pretty light weight making it easy to move from car to car when necessary. Thankfully my husband and I both have new(er) cars now. Our previous SUV was a pathfinder that was a bit older and did not come with the child restraint latches. Unless you are a Yoga-pro or are ready to stand on your head while trying to figure out how the heck you're going to install the car seat...it's going to be a challenge. Either way, your top priority should be safety and nothing out ranks a Britax when it comes to safety. It's worth the buy and we wouldn't have gone any other way.
2 of 2 people found this review helpful
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Love it!

5
Reviewer: Tiffany O. , Wyoming, MN Date: April 26, 2008
we purchased the Marathon for my daughter when she outgrew her infant seat and have owned it for 4 years. It is easy to use and now she can manage getting in and out on her own. The belt is easy to tighten and the seat is very comfortable. I would recommend this carseat as the weight and height limits are higher than the roundabout. It really provides for flexibility when considering the timing of moving into a booster.
2 of 3 people found this review helpful
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Easy to Use

5
Reviewer: Anonymous , Chicago, IL Date: April 14, 2008
When we first received the Marathon, we were worried it wouldn't fit into our 2007 Prius, but it installed quickly. What we like most about this car seat is how comfortable it is for our son (8 months and about 20 pounds) and how easy it is to get him in and out. The straps cinch up tightly, but we can loosen them without difficulty or a lot of tugging. It's also good to know that the Britax products come highly recommended for safety. Once again we were thrilled with the service from TipToeTurtle.com -- the seat arrived one day after we placed our order! Also we knew we didn't have to worry about problems with returning, etc. if the seat had not fit in our car.
3 of 4 people found this review helpful
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