Britax Marathon G4 Convertible Car Seat - Cowmooflage

This item is discontinued.
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The Marathon is purposefully designed and engineered to minimize the forward movement of the child’s head during a frontal impact to reduce the risk of head injury with the following revolutionary BRITAX head safety technologies:

Base with SafeCell Technology features SafeCells designed to compress in a crash, significantly lowering the center of gravity and counteracting the forward rotation of the child seat which normally propels the child toward the front seat

Integrated Steel Bars strengthen the connection to the vehicle and reduce forward flexing of the child seat during a crash

Energy-Absorbing Versa-Tether features a staged-release tether webbing to slow the forward movement, reducing the crash forces reaching the child, and a two-point attachment to minimize forward rotation while anchoring the top of the child seat

  • Quick-Adjust Harness repositions the harness shoulder height without disassembling the harness straps
  • Side Impact Protection comprised of deep side walls lined with energy-absorbing EPP foam distributes crash forces, shields from vehicle intrusion, and contains the head, neck and body
  • Tangle-Free, Five-Point Harness distributes crash forces across the strongest parts of the body and provides a secure fit
  • HUGS (Harness Ultra Guard System) Chest Pads provide resistance to forward movement in the event of a crash
  • 65-pound Weight Capacity for safety and comfort as your child grows
  • Rear and Forward Facing Recline for child comfort and positioning
  • High Density Comfort Foam provides an extra layer of padding to gently cushion your child
  • Easy-Remove Cover allows easy cleaning, without disassembling the harness or uninstalling the car seat
  • Two Buckle Positions for your growing child
  • EZ-Buckle System and Harness Holders keep harness straps out of the way when placing your child in the car seat
  • Premium Lower LATCH Connectors for a quick and simple installation featuring a push button for easy release
  • Built-in Lock-Offs ensure a snug lap and shoulder belt installation with minimal effort
  • Anti-Slip, Contoured Base grips and protects the vehicle seat while offering optimum vehicle fit
  • Infant Positioning Pillow offers extra comfort while achieving proper harness fit for small infants
  • Certified for Aircraft Travel
  • Made in the USA with global components
Child Weight (lbs) Rear Facing: 5 - 40 Forward Facing: 1 year and 20, up to 65
Child Standing Height (in) 49 or less
Child Seated Shoulder Height (in) Rear Facing: 9 - 16.75 Forward Facing: 12 - 16.75
Product Weight (lbs) 19.5
Product Dimensions (in) 18.5W x 26H x 21D
Seating Compartment Height (in) 23.5
Seat Area Depth / Width (in) 11 / 11
Shoulder Width (in) 13
Harness Slot Heights (in) 8.5 / 9.5 / 10.5 / 11.5 / 12.5 / 13.5 / 14.5 / 15.5 / 16.5 / 17.5
Buckle Strap Depths (in) 5 / 7.5
Product Reviews
out of 5.0
488 Reviews
Ratings Snapshot
of Reviewers
New York
Verified Buyer
Safe, reliable choice
November 26, 2022
We love this car sat--it has been easy to use, easy to clean, and I feel great about the safety of it.
Verified Buyer
March 30, 2022
This lasted us over 4 years and is still in great shape
Verified Buyer
Excellent seat
May 23, 2020
The best investment for you and the baby. Very easy to use seat. Quality build. Plus it's made in USA.
This product review was collected by the manufacturer.
Yucca Valley, CA
Verified Buyer
December 3, 2019
I love this carseat. You get the safety with the Britax name but the carseat itself its huge. Fairly lightweigh and very easy to install. I love that the head area doesn't have the bulky side impact portions because our car is more narrow and we have two carseats side by side. Great buy!
  • More narrow than other models
  • Easy to install
  • Great quality
Best Uses
  • Infant-Toddler (rear and front facing)
Stover, Missouri
Verified Buyer
August 15, 2019
Have tried other car seats but this one is definitely our favorite by far! So many nice features but what I appreciate most is that it is one of the less chemically contaminated car seats I can safely put my child in. Have already recommended to friends and family.
Flushing, NY
Verified Buyer
Great car seat - straps can get twisted though
April 10, 2019
This is a very safe and sturdy car seat - it also seems to be quite comfortable. The one con is that the straps get twisted frequently which is pretty annoying.
Verified Buyer
Mostly good
February 28, 2019
I liked the Britax safety and price tag of this seat. Unfortunately and it turns out, not having cup holders is a major issue. My three year old just drop some her cup because she has no where to put it. The Britax cup holder sold separately has many many bad reviews. In addition, there's only 2 crotch strap adjustments. She's starting to complain it hurts. I would say this seat was great from 12 months to 3. But I can foresee us replacing the seat in the future. I'd still recommend the seat. It was a good price, safe, and lasted a couple years.
This product review was collected by the manufacturer.
Verified Buyer
Baby does not fit
December 27, 2018
I bought it for my newborn because your description states that it can be used since birth. But sadly my baby does not fit at all. Her head drops sideways in a very uncomfy manner and can hardly breathe. Very disappointed with Britax since for obvious reasons I can't use the seat. Also the belts cannot be adjusted right around her legs... I don't really understand why the description states that it can be used for newborns if it is not true.
This product review was collected by the manufacturer.
Omaha, NE
Verified Buyer
Perfect for rear facing and forward facing
October 6, 2018
We bought two of these for our oldest child. He rear faced in this car seat for over a year after he outgrew his infant britax carseat and is now forward facing. It has worked great in both positions.
This product review was collected by the manufacturer.
New England
Verified Buyer
Very sturdy.
August 28, 2018
This convertible car seat is very sturdy and feels like it would give excellent protection.
The directions are complete and fairly easy to follow to install the car seat.
Verified Buyer
Excellent Carseat
August 15, 2018
My daughter & son in law have two of these car seats. Son in law a fireman and daughter is in the medical field. Safety number one. The only car seat to there standards . Grandma had to buy for grandson on the way.
Verified Buyer
Great Value
August 2, 2018
I love Britax products, they can't be beaten when it comes to quality and safety. I was so excited to find this car seat at a super deal. My son is very comfy in his new seat.
Verified Buyer
Easy to install and durable
July 26, 2018
My son is 8 and has Down syndrome. He will be small enough for a seat for a long time, and this seat is still working for him. Super easy to install, take in and out if needed, and he can even hook the harness himself because the belts don't twist like other brands.
This product review was collected by the manufacturer.
K H.
Verified Buyer
Love this carseat
July 11, 2018
I have to admit that I was a little skeptical when I ordered this car seat for my grandson. I was pleasantly surprised when it arrived. What an amazing value! Easy to install and so comfortable.
St. Louis, Missouri
Verified Buyer
Fantastic Sturdy Car Seat
June 7, 2018
I am very impressed with the car seat! It is very sturdy, easy to install and is easy to put our six-month-old in and out of. It fits great in our sedan (Chrysler 200). I'm not crazy about the print, but you can't beat the price and the material is well made. Overall, I would purchase it again. Britax & Albee now have a loyal customer.
  • Easy to install
  • Well made
  • Safe
  • Straps easily move
  • Fits well in sedan
  • Kind of heavy when putting into the car
Verified Buyer
Works great
June 7, 2018
I agree with out reviews - please disregard the reviews where people are using the car seat erroneously. The latch system works great in cars with anchors, easy to tighten and they stay tight until physically loosened. Straps adjust perfect for my very large 2 year old. I'm not a fan of chest clips but they are required in the U.S. - no issues with them breaking.
This product review was collected by the manufacturer.
Verified Buyer
Awesome car seat!
June 4, 2018
This was exactly what I was looking for. Safety is number one and it doesn't get safer than Britax. My baby girl loves it. She is 15 months and 20 pounds rear facing. I have four kids and they all ride in Britax seats.
Customer Images
MI - Michigan
Verified Buyer
Great Seat at a Great Price
May 31, 2018
This car seat was very easy to install (correctly) with the LATCH system. it is very well made compared to others we looked at.
Danny E.
Grass Valley, ca
Verified Buyer
great car seat!!
May 23, 2018
we have had this car seat for 4 years and have had no issues with it. my daughter is now 4 and fits perfectly. if you follow some of the other pointless reviews of some people misusing the seat then you will be steered in the wrong direction about this seat. for example, you dont buckle you kid in the seat with a winter jacket, the straps are not supposed to be all the way above the shoulders. anyway, the seat is very easy to install using the latch system but the only down fall for us is removing the seat to put in another car. the latch belts dont easily loosen which in my opinion can be a good thing so you dont have to worry about it loosening on its own. cleaning is very simple. it is one of the easiest to take apart. (i have been dealing with car seats for the last 13 years). i just washed it this last weekend. took me all of 60 seconds to strip it down, belts and all. the longest part was waiting for the washer and dryer.
This product review was collected by the manufacturer.
San Leandro, California
Verified Buyer
Great Car Seat
May 18, 2018
I really liked this car seat. Is comfortable and you can modify it to be all the way up or leaned back when the baby is sleeping.
Walterboro, SC
Verified Buyer
We have a Winner!
May 7, 2018
Fast delivery, easy set up! Looks great and my little one loves it!
T N.
Memphis, TN
Verified Buyer
Excellent seat, excellent service
May 2, 2018
This seat is such good quality! All the materials are excellent and the finishing touches make for a great product. I was very pleased with the shipping time, and the price was unbeatable!
  • Fits well, rear facing, in my sedan, at recline position “3,” for my 1 year old. All the seat Padding is plush, straps don’t twist easily and extra touches like the comfort pad on the buckle keep the straps from pinching baby’s chubby legs. This seat will grow with my child, very well!
Best Uses
  • 9 months, and older, if using in a sedan. Perfect for any age, in a larger vehicle.
  • Would be a tight squeeze in my sedan, at the recline setting for a smaller infant.
Las Vegas, NV
Verified Buyer
April 26, 2018
I have four of these Car seats. Two in each vehicle and they are amazing have never had any problems with them. Would highly recommend
Roanoke, In
Verified Buyer
Best Seat!!!
April 16, 2018
This is the 5th Britax car seat we have purchased for our 4 children. Four of them have been the Marathon and we couldn't be happier! They are easy to move from one car to another and strapping the baby in is a breeze!
Staunton VA
Verified Buyer
Love it
April 13, 2018
Great quality, cute design
Verified Buyer
Quick shipping & good product
March 31, 2018
Carseat arrived quickly & everything appears to be great- we used this same model carseat with my first child & wanted to get the same one the 2nd time around- glad to find it much cheaper on this website
Boynton Beach, Florida
Verified Buyer
Great Seat
March 22, 2018
I had a Boulevard for my son. I thought I was purchasing another BLVD until I saw the box at the front door. I considered returning it since I really wanted a blvd. I decided to keep it and it is actually really nice. Easy to install, very comfy looking, and I love the colors!
Tennille V.
Coral Springs, Fl
Verified Buyer
Love this car seat
March 21, 2018
Always use Britax for each of my kids. Such a beautiful seat cover and easy strap adjustments
Wenatchee, WA
Verified Buyer
Love this car seat!
March 19, 2018
We are very happy with this car seat. It's always difficult to narrow it down when you have so many factors to consider, including price, but this was a surprisingly easy choice. After a little research this one checked all of the important boxes and Albee Baby offered the lowest price (with free 5-day shipping).
  • Comfortable, wide size
  • Heavy duty steel frame (this is a GOOD thing)
  • Super adjustable (rear and forward facing option)
  • Our son loves the blue/black colors
  • Incredibly easy to install with the latch system
Edmond, OK
Verified Buyer
Love this website
March 18, 2018
I got a top rated car seat for a fraction of the cost it would be from any other regular retail store! I will definitely be purchasing all future car seats from this sight!
  • Fast shipping
  • Great price
  • Variety
  • Absolutely zero cons
T B.
Tacoma, WA
Verified Buyer
Love this car seat!!
March 8, 2018
This specific car seat met all the safety requirements I was looking for in a seat for my one year old. Love how comfortable she is rear faced, also how youre able to adjust the seat easily. The color and pink giraffe print is even better in person!
  • Safe and secure.
Best Uses
  • Rear facing and reclining features make the car seat safe and comfortable.
  • Not the lightest car seat but itâ
Customer Q&A