The Britax Marathon 70 convertible car seat is designed for children rear facing from 5 to 40 pounds and forward facing from 1 year and 20 lbs up to 70 pounds. The Marathon 70 achieves revolutionary head safety through the use of Britax SafeCell Technology, integrated steel bars, and versa-tether that work together to minimize head excursion and reduce the risk of head injury during a frontal impact. The Marathon 70 also incorporates Britax side impact protection, offers a no-rethread and quick-adjust five-point harness, multiple buckle and recline adjustments, and an easy access cover and access to belt paths from the front of the seat. A head and body pillow is provided for comfort.
what parents are saying
We have 2 of these car seats they are that amazing. The are roomy, comfortable, but still have room in the back seat for 3 across. Love Britax! (Jul 12, 2016)
This is our third Britax. My husband prefers this one to our Boulevard since there’s less bulk, it doesn’t have the secondary side impact protection. Easy to install, adjust, and wash the cover.
Oct 22, 2017
I received this car seat as a gift and it is seriously way too huge to put a newborn in it, even with an infant snuggle! We plan to use it as a second car seat once our baby is 6+mo old. Its heavy too
Jun 10, 2017
One of our favorite car seats. Easy to install. Cleans up awesome. Has foam that can be broke if not careful with instal or cleaning though. Adjustments easy. Fits in most vehicles. It is heavy though
May 22, 2017
This was not one of my favorite car seats. It's pretty wide and takes up a lot of space and the straps often get tangled or stuck. It does feel pretty sturdy but I still wouldn't recommend.
May 16, 2017
I've used this carseat for 2 kids and it has held up nicely. My kids seemed comfortable and I felt they were very safe. It is a bit heavy though for travel or taking it out of the car often.
May 02, 2017
I will agree with most complaints that this car seat is quickly outgrown because the straps only go so far up. This isn't a problem for my small kids. The small base is great. No cup holder though
May 08, 2016
Love this car seat. Seems very sturdy and safe. My daughter seems comfortable in it. Easy to install. Be aware, there is no metal ball/level for recline; this wasn't an issue for me but FYI.
Apr 22, 2016
Like. I do have issue with how easily the cover is coming apart after having to wash it. The strings are pulling off. Replacing it has been hard. Seat is very safe, top priority. No cup holders bummer
Feb 01, 2016
Love this convertible car seat! It works well front and rear-facing, and isn't too much of a space hog in our Prius backseat. The cow print is our favorite, and the removable cover is clutch.
Oct 02, 2015
Owned 3 Marathons, and they fit all the children well.Easy to adjust.They are bulky. Very well padded, and the covers withstood normal kid abuse. Couldn't do 3 across, and 1 had buckle issues.
Oct 17, 2014
Easy to clean and keeps kids rear-facing for a LONG time with plenty of leg room. My three-year-old is the size of a typical five-year-old and it's his favorite seat for long travels. –Chelsea D.
Apr 03, 2014
We just purchased this seat so we aren't sure yet how it will be. Baby clips in very easily and once you've figured it out, adjusting the seat to fit is not too hard. Study the manual, though!!
Mar 16, 2014
We like that our seat has straps that are less likely than others to get tangled, but the straps still get tangled http://hintmama.com/2013/11/13/todays-hint-3-tricks-for-untangling-car-seat-straps/
Jan 13, 2014
This is a high quality product and I love all of the safety features. I thought it was complicated until I installed it & realized it really wasn't. We have 3 of these now! (me, husband, grandma!)
Dec 30, 2013
Suck it up, spend the $, and just get this seat. Not only does it get top safety reviews, but it will grow with your kid-- if you're not picky about colors, you can get good deals on these.
Jul 03, 2013
Yes, this is better for an older child. I would not recommend it for an infant. I went with the Chicco KeyFit when my son was born and switched him to the Britax Marathon when he was about 8 months or so.
Agreed. We bought this around our son's 1st birthday and he was in an infant car seat (Graco Snugride) before then. Not ideal if you only want one car seat, but we have been more than happy with it as he grows.
Mine is in my ginormous SUV and it's great. My husband has one in his Audi sedan - it fits, and it's okay, but it doesn't leave a ton of room. That said, I LOVE this car seat - it's one of the safest on the market and when it comes to safety products for my kids, function wins every time.
I have a VW golf so a compact car & have been VERY happy w/ this - we actually have more space issues w/ our 2nd rear facing car seat (for a baby). It's better if the passenger side front seat is not all the way back to give a little legroom for our toddler but it's fine.
We've had ours rear-facing in a Ford Focus for about a year. It works, but agree that the passenger side front seat is pretty far up to accommodate the space. We love the seat, though, as it's very easy to use and travels well.
This is very easy to use, if you're using the latch system or just a seatbelt securing it. My friend has the same exact one and often throws hers in my car when we go on trips, and she quickly just secures it with a seatbelt. It's not light and it's not small, so I wouldn't say it's easy to travel with, but I LOVE it and couldn't be happier with it.