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Britax Marathon 70-G3 Convertible Car Seat, Chili Pepper (Prior Model)

3.2 3.2 out of 5 stars 125 ratings
Currently unavailable.
We don't know when or if this item will be back in stock.
Brand BRITAX
Installation Type Latch
Material Foam
Color Chili Pepper
Orientation Forward / Rear Facing

About this item

  • 100% Polyester
  • Made in the USA and Imported
  • Base with safecell technology 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
  • HUGS Harness Ultra Guard System chest pads provides resistance to forward movement in the event of a crash
  • 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
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Product Description

Product Description

The Britax Marathon 70-G3 convertible car seat accommodates children rear facing from 5 to 40 pounds and forward facing from 20 up to 70 pounds. The Marathon 70-G3 is purposefully designed and engineered to minimize the forward movement of your 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 designed to compress in a crash, significantly lowering the center of gravity and counteracting the forward rotation of the child 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 two-point attachment and staged-release tether webbing to slow the forward movement and reduce the crash forces reaching the child. The Marathon 70-G3 also incorporates Britax side impact protection to contain the child and protect from the most severe types of crashes. The five-point harness is tangle-free with an fez-buckle system to retain the harness buckle in a forward position and harness holders that keep harness straps pulled to the sides to make boarding quick and hassle-free. Other features include a no-rethread harness and an easy-remove cover that also allows access to belt paths from the front of the seat, while the multiple buckle and recline positions, comfort pads, and infant body pillow provide premium comfort and positioning.

Amazon.com

Packed with comfort and safety features, the BRITAX MARATHON 70-G3 Convertible Car Seat is designed with 360-degree protection to keep your child secure in the event of a crash. It offers high-density comfort foam for extra support, a cushiony cover, and an EZ-Buckle system for convenience when harnessing your child. The MARATHON 70-G3 accommodates children rear facing from 5 to 40 pounds and forward facing from 20 to 70 pounds.

MARATHON 70-G3
Convertible Car Seat
(Chili Pepper)
At a Glance:
  • Side Impact Protection system with energy-absorbing foam diverts crash forces
  • Base with SafeCell Technology compresses to counteract forward momentum
  • Energy-Absorbing Versa-Tether anchors seat and slows forward movement
  • Integrated steel bars reinforce seat stability
  • Tangle-free, no-rethread, five-point harness provides a secure fit
Age/Weight Requirements:

5 to 40 pounds rear facing; 20 to 70 pounds forward facing

Warranty:

Limited one-year warranty

With the Side Impact Protection system, energy-absorbing foam helps divert crash forces. View larger.

SafeCell Technology helps to minimize the risk of head injury during a collision. View larger.

The EZ-Buckle System maintains the harness buckle in a forward position to prevent your child from sitting on it when boarding. View larger.

Side Impact Protection System Diverts Crash Forces

The BRITAX Side Impact Protection system includes a rigid shell with deep sidewalls lined with energy-absorbing EPP foam to contain your child's head and body and divert crash force energy while creating a barrier against possible intruding objects. This system also protects your child's head and chest.

SafeCell Technology for Advanced Protection

The base of the MARATHON 70-G3 includes SafeCell Technology comprised of SafeCells, an engineered material designed to compress in a crash. This compression lowers the center of gravity to counteract forward rotation of the seat, helping to minimize the risk of head injury during a collision.

Located in the sides of the seat shell, integrated steel bars strengthen the connection to the vehicle and prevent forward flexing of the seat during a crash to reduce the risk of head injury.

In the event of a sudden stop, the Energy-Absorbing Versa-Tether strap restricts forward movement and reduces crash forces with patented staged-release webbing and a 2-point attachment. This webbing securely anchors the top of your child seat to your vehicle in either rear- or forward-facing positions.

No-Rethread Harness System and Comfort Features

The tangle-free, five-point harness allows for multiple height positions and can be adjusted without dismantling the harness or removing the car seat from the vehicle. Two buckle positions provide a snug, comfortable fit as your child grows. The seat's harness holders prevent the straps from getting in the way when you're putting your child in the seat, while the EZ-Buckle system maintains the harness buckle in a forward position to prevent your child from sitting on it when first entering the seat. Rear- and forward-facing recline options, as well as high-density foam cushioning, help your child relax on the journey. And the plush cover comes with matching comfort pads and an infant body pillow to keep children of all ages comfortable and secure.

Easy Installation and Airplane-Approved Design

The MARATHON 70-G3 takes the guesswork out of installing your car seat thanks to a range of convenience features. An anti-slip, contoured base grips and protects the vehicle seat. Premium lower LATCH connectors make for a quick, simple, and tight installation, while the push-button allows you to easily uninstall the car seat. And easy-to-access built-in lock-offs provide a secure installation when using the vehicle lap and shoulder belt.

The MARATHON 70-G3 has a durable cover that can be removed for easy cleaning without uninstalling the car seat. It's also approved for airplane travel.

Product and Warranty Information

The BRITAX MARATHON 70-G3 is made in the USA, has a seven-year life, and is backed by a manufacturer's limited one-year warranty.

What's in the Box

BRITAX MARATHON 70-G3 Convertible Car Seat, removable cover, comfort pads, infant body pillow, and user guide.

Click here to compare BRITAX car seats.

ROUNDABOUT 55

MARATHON 70-G3

BOULEVARD 70-G3

PAVILION 70-G3

ADVOCATE 70-G3

Trademark Information:

MARATHON™

SafeCell Technology®

Energy-Absorbing Versa-Tether®

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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Britax Marathon 70-G3 Convertible Car Seat, Chili Pepper (Prior Model)

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Customer reviews

3.2 out of 5 stars
3.2 out of 5
125 global ratings

Customers say

Customers like the ease of installation, quality, comfort, fit and value of the infant toddler car seat. They mention that it's easy to install and uninstall, sturdy, and stable. They appreciate the plush fabric and that it fits well in smaller backseats. Overall, customers say it'll last for a few years and is worth the purchase.

AI-generated from the text of customer reviews

66 customers mention51 positive15 negative

Customers like the ease of installation of the infant toddler car seat. For example, they mention it's easy to install and uninstall, and to take apart to wash. Some say the seat is easy to take child in and out of, and that the features are easy to use.

"...It was actually quite easy though. And now I could do it pretty fast for the second time. I used the LATCH system and it was pretty straightforward...." Read more

"...It is super easy to get her in and out of it and I know she is very comfortable...." Read more

"...I find the features easier to use than the Graco 65, but otherwise I'm not sure why this one costs so much more, because I find them on-par for..." Read more

"...this to anyone looking for a great seat that is comfortable, easy to install, fits even in smaller backseats, and is cost effective without..." Read more

60 customers mention57 positive3 negative

Customers are satisfied with the quality of the infant toddler car seat. They mention that it is sturdy, safe, and made of high quality materials. Some appreciate the cool colors and the solid installation. Overall, customers find it to be one of the best convertible car seats out there.

"...I love the material, it really feels nice and comfortable. The seat is also padded nicely...." Read more

"...Brica Koosh'n Infant Neck & Head Support ($13) - this is a great little head/neck pillow to keep your kid's head from flopping to the side when they..." Read more

"...This is much better. Its easier to get baby in the car and his head doesn't fall over when he's asleep now...." Read more

"...It's a solid install...." Read more

48 customers mention43 positive5 negative

Customers like the comfort of the infant toddler car seat. They say the seat is plush, soft, and has good padding. Some say the frame is metal and the seat has a lot of cushion.

"...The seat is also padded nicely. The velcro on the sides is nice because it holds the straps up so they don't get tucked under my daughters bottom...." Read more

"...It is super easy to get her in and out of it and I know she is very comfortable...." Read more

"...The seat is well padded and easy to clean. It looks like a chair my husband and I would love to take a nap in...." Read more

"...Once secured, the chair barely moves at all when pushing side to side. It's a solid install...." Read more

28 customers mention25 positive3 negative

Customers like the fit of the infant toddler car seat. They mention it's easy to install, fits even in smaller backseats, and should fit their kid for a few years. The sucker works well and does fit the Britax Marathon. The seat looks great and it fits well rear facing in their Lexus IS250. It takes up less space than the Graco Snugride that they had before, and it allows for plenty of leg room.

"...It fits perfectly. I can move the front seats back as much as I like...." Read more

"...Seat Sun Shade" ($7) - this sucker works really well and does fit the Britax Marathon, and it keeps the seat nice and cool on hot summer days; and..." Read more

"...This seat looks great and it fits well rear facing in my Lexus IS250...." Read more

"...Notes during installThe seat belt clips were right in place and made the seat fit sturdy..." Read more

26 customers mention21 positive5 negative

Customers like the value of the infant toddler car seat. They mention it's worth the purchase, cost effective, and takes up less space. Some say it'll be a good investment, and the quality of the seat is top-notch.

"...to install, fits even in smaller backseats, and is cost effective without compromising quality or safety!" Read more

"...Definitely worth the extra $50, it actually takes up less space than the carrier carseat, it fits great in our Toyota Corolla...." Read more

"...After comparing several britax models, this seemed to be the best bang for our buck...." Read more

"...100% worth the money spent! I wish we would have gone with Britax from the beginning!" Read more

24 customers mention24 positive0 negative

Customers like the color of the infant toddler car seat. They say the design and colors are nice, trendy, and well designed. Some mention that the car seat is easy to wipe clean and looks like new.

"...This seat looks great and it fits well rear facing in my Lexus IS250...." Read more

"...It looks great, fits awesome in my back seat, and is really comfortable for my daughter...." Read more

"...It's very sturdy and stylish." Read more

"...We love this car seat, and the color is great. Its very confy and the fabric feels nice...." Read more

22 customers mention22 positive0 negative

Customers are satisfied with the safety of the infant toddler car seat. They mention that it offers good protection to the child, and is well designed. Some appreciate the easy seat belt.

"...The Marathon is bulky, yes, but I feel very safe with her in it. It is super easy to get her in and out of it and I know she is very comfortable...." Read more

"...It's a pain. I guess it's safe enough. It's just nothing like our old chicco. I would definitely buy a different brand next time...." Read more

"So far, great seat. Love the comfort. It seems durable and safe...." Read more

"...Sturdy and safe but room for improvement regarding the seat belt adjustment." Read more

14 customers mention12 positive2 negative

Customers like the adjustment of the infant toddler car seat. They mention that it adjusts very easy, has a nice recline-adjust feature, and is easy to install. They also appreciate the sliding height adjustment and find it to be the best for adjusting the seat in a reclined position.

"...I love how easy it is to get my baby in and to adjust the size and position...." Read more

"...Using it forward facing is much easier, and makes all the adjustments easy to reach and use...." Read more

"...Feels and looks safe. Easy to install. Nice recline-adjust feature to allow the seat to be more upright when backward facing...." Read more

"...Installation and uninstallation is quick and easy as well as strap adjustment...." Read more

Top reviews from the United States

Rach
5.0 out of 5 stars Fantastic Car Seat that fits great in my car!
Reviewed in the United States on August 6, 2012
Verified Purchase
This car seat makes the other two I have seem like crap. I was given a Safety First Alpha and Omega, it's ok but it's hard to install correct and currently it is slanting to the left, I have to figure that out. I also bought a cheaper $40 Cosco Scenera from Walmart as a back-up car seat to go to my mom's. It is hard to get tight and it moves a lot front to back.

I had looked for a car seat for a couple weeks. I read review after review. Anytime one had a negative review I debated whether I should get that car seat or not. I started getting a bit paranoid about getting the perfect car seat for my daughter. I mean she is my most precious cargo.

First off, SIZE: my HUGE concern when getting a convertible seat was that it would fit in my Mazda 3 rear-facing. Many reviews of car seats I was interested in mentioned how huge they were and how difficult to fit in a smaller car. Some reviews mentioned how well this (Britax) fit in cars so I decided to give this one a try (because it also had great reviews based on safety and comfort etc...)It fits beautifully. If you install it directly behind a seat you'll probably have to move the seat up just a bit, but not bad. I like to put the seat in the middle though because that is the safest place. It fits perfectly. I can move the front seats back as much as I like. This was a huge selling point for me, and I know that when I was reading reviews it was something I was specifically looking for. I want to keep my daughter rear-racing as long as I can, so I needed it to fit nicely. I also love that this seat has a higher rear-facing weight limit of 40 lbs.

INSTALLATION: It took me a little bit at first but that was only because I was reading the manual carefully and familiarizing myself with the parts of the seat and the parts in my car. It was actually quite easy though. And now I could do it pretty fast for the second time. I used the LATCH system and it was pretty straightforward. But with every other car seat I have had I have used the seat belt. That way didn't look bad either. What I really liked about installing it with the seat beat route is that it has a locking mechanism under the car seat fabric that actually will hold the seat belt in place. You won't have to use those metal locking clips. The best part was after it was installed the car seat did not move! AT ALL! It didn't move side to side or even front to back it was solid. Another thing that I absolutely love about this seat is that I didn't have to use a stupid pool noodle to make it level. That always seemed lame to me that so many car seats are level on the floor, but most vehicles seats are slanted. Adding a pool noodle or rolled towel has always bugged me.

I love the material, it really feels nice and comfortable. The seat is also padded nicely. The velcro on the sides is nice because it holds the straps up so they don't get tucked under my daughters bottom. I also love how there is padded material that goes behind the buckle. This is nice because the straps won't dig into her chubby little legs.

I only have one negative thing to say, and that is more about the instruction manual. When it mentions the tersa tethering, I was a bit confused. I didn't understand based on the manual how to tether rear-facing. It was very vague. One thing, is you don't have to tether rear-facing it's optional (the manual made it sound like you had to) the other thing I thought is I needed an actual tether thing on the floor (like the one on the backs of seats). But you can tether using anything on the floor of your car that is bolted down. I used part of the track to move the front seat forward and back.

I love this seat and I would recommend it to anyone!
91 people found this helpful
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S. Chaffin
4.0 out of 5 stars Britax repeat customer
Reviewed in the United States on March 1, 2013
Verified Purchase
We bought the older model of the Marathon about 8 months ago and have been so pleased with it that we finally bought this new model (70-G3) for our second vehicle since our daughter has maxed out her infant seat. I considered buying a cheaper seat since it's going in my husband's car, but he does drive our 17-month old to daycare every day, and when it comes down to it, we don't want to take any chances and you just can't put a price on your child's safety. The Marathon is bulky, yes, but I feel very safe with her in it. It is super easy to get her in and out of it and I know she is very comfortable. I docked a star for two reasons: 1) You have to purchase a cupholder separately. Seriously, Britax, you can't just include it? 2) We've never been in a car accident so I can't personally attest to the safety aspect. But one big reason (other than safety) I will continue to buy Britax: made in the USA.

In addition to this seat (or any seat, for that matter), I also recommend two additional purchases: the "Mommy's Helper Car Seat Sun Shade" ($7) - this sucker works really well and does fit the Britax Marathon, and it keeps the seat nice and cool on hot summer days; and the Brica Koosh'n Infant Neck & Head Support ($13) - this is a great little head/neck pillow to keep your kid's head from flopping to the side when they fall asleep. It's not just for infants, as the name implies. My toddler still uses it.
3 people found this helpful
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MrsD
3.0 out of 5 stars Not a fan, but we're keeping it.
Reviewed in the United States on October 5, 2013
Verified Purchase
Well, I originally ordered this from Amazon. The box was badly damaged and the carseat was actually broken :( Amazon was AMAZINGLY easy to work with as far as returning it. We bought another at a local store, same seat though. I have to say, it's QUITE difficult getting my daughter in and out of. It's also difficult getting the harness to fit her well-she's small for her age. Our baby carseat was a chicco and SOOOOO Darn simple to use and adjust that I just assumed all carseats were. Wrong. To adjust the belt on the bottom latch connectors, you actually need a key or a pin to help. It's a pain. I guess it's safe enough. It's just nothing like our old chicco. I would definitely buy a different brand next time. Oh my goodness, I would never ever use this carseat on an infant. It would be a nightmare getting them in the darn thing.

Also, we found the instructions to be confusing in certain places.

One positive, adjusting the shoulder height is a cinch!
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J. Wang
1.0 out of 5 stars Want to sell it
Reviewed in the United States on August 11, 2013
Verified Purchase
...want to sell it for 10% of the price and see if anyone would take it. It is so hard to install and it heats up so quickly that my little one can't seem to stay seated unless I jack up the AC. and the seat belts are way too chunky and thick that it hurts their delicate skin when wearing tank tops. Not recommending it and want to sell mine! If anyone wants this at 1/5 of the price please let me know! I only bought it July of 2013!
2 people found this helpful
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frances L
2.0 out of 5 stars sticky residue on the inside cushion
Reviewed in the United States on October 18, 2012
Verified Purchase
sticky residue on the inside cushion, possibly excessive flame retardant. returned the product, i feel that if may be unsafe for my baby to be exposed to the excess chemicals.
One person found this helpful
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