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  • Britax Marathon 70 Convertible Car Seat (Previous Version), Onyx
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Britax Marathon 70 Convertible Car Seat (Previous Version), Onyx

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Price: $319.99 + $24.95 shipping
Only 4 left in stock.
Ships from and sold by Boston Bella Baby LLC.
- Onyx
  • The Britax Marathon 70 convertible car seat is designed for children rear facing from 5 to 40 pounds and forward facing up to 70 pounds
  • 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 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
  • 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
  • Quick-adjust harness repositions the harness shoulder height without disassembling the harness straps
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3 new from $297.00
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Frequently Bought Together

Britax Marathon 70 Convertible Car Seat (Previous Version), Onyx + Britax Child Cup Holder
Price for both: $331.99

These items are shipped from and sold by different sellers.

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  • Britax Child Cup Holder $12.00

Product Information

Color: - Onyx
Technical Details
Item Weight18 pounds
Product Dimensions19.5 x 18.5 x 26 inches
UPC652182063917
Item model numberE9LB11A
Minimum weight recommendation5 Pounds
Maximum weight recommendation70 Pounds
Additional product featuresAdjustable Head Support
Number of items1
  
Additional Information
ASINB003OUWIJY
Best Sellers Rank #33,379 in Baby (See top 100)
Shipping Weight22.2 pounds (View shipping rates and policies)
ShippingCurrently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  
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Product Description

Color: - Onyx

Amazon.com

The BRITAX MARATHON 70 Convertible Car Seat achieves optimum head safety through the combination of BRITAX SafeCell Technology, integrated steel bars, and a Versa-Tether, which work together to minimize head excursion and reduce the risk of head injury during a frontal impact. It also features easy installation, Side Impact Protection, and innovative details for your child's comfort and safety. The seat fits children in the rear-facing position weighing from 5 to 40 pounds, and children in the forward-facing position starting at one year old and 20 pounds, up to 70 pounds.

callout box top

MARATHON 70 (Onyx)
Convertible Car Seat

At a Glance:
  • Age/Weight Requirements: In rear-
    facing position, fits children weighing 5 - 40 pounds; in forward-facing position, fits children 1+ years old weighing 20 - 70 pounds

  • Warranty: 1-year
    limited warranty

callout box bottom
Britax Marathon 70 Convertible Car Seat


Available in (from left to right):
Onyx, Crimson, Waverly,
Cowmooflage, Blueprint, and Allison.
Britax Marathon 70 Convertible Car Seat
Safety features include SafeCell Technology and True Side Impact Protection.
View larger.
Britax Marathon 70 Convertible Car Seat
Comfort features include dual recline positions and high-density comfort foam.
(Shown here in Allison.) View larger.
BRITAX 360 Degree Protection
The BRITAX MARATHON 70 features technologies that work to minimize injury to your child during a crash from any direction, including both frontal and side impact crashes - the most frequent types of crashes. These technologies work together with other features on the car seat to minimize injury to your child during a crash by:

  • keeping your child in the vehicle,
  • diverting crash forces away from your child,
  • helping to slow down your child's body,
  • minimizing movement of your child, and
  • protecting your child's brain and spinal cord.
SafeCell Technology for Advanced Head Safety
Designed with SafeCell Technology, the MARATHON 70 features SafeCells, which are engineered structures located in the base of the seat designed to compress in the event of a crash. This compression significantly lowers the center of gravity and counteracts the forward rotation of the car seat, delivering unprecedented performance in a crash.

The MARATHON 70 also features integrated steel bars, which strengthen the connection to the vehicle seat and reduce the forward flexing of the car seat. In addition, the energy-absorbing Versa-Tether anchors the top of the car seat and minimizes forward rotation of the car seat to reduce the crash forces that can reach your child if an accident occurs. These three features work together as a system to provide revolutionary head safety protection for your child.

Side Impact Protection for Added Security
To keep your child safe in the event of a side-impact collision, the MARATHON 70 includes Side Impact Protection. Side Impact Protection is a system composed of a rigid seat shell with deep side walls and energy-absorbing EPP (Expanded Polypropylene) foam lining the seat shell. These combined features work together to protect your child's head and chest from incoming crash forces by distributing the forces over a larger surface area, helping shield your child from vehicle intrusion and contain your child's head and body in the seat.

Premium Fit and Comfort Features
Whether children are watching the world go by or snuggling in for a nap, they'll enjoy that the MARATHON 70 reclines in both the forward and rear positions. And thanks to additional features, which include high-density comfort foam and a plush cover set with a matching belly pad, they'll always ride in style and comfort. A 70-pound weight capacity, two buckle positions, and a tangle-free five-point harness with ten harness-height settings provide a snug, custom fit for your growing child. Plus, an optional Infant Positioning Insert (sold separately) allows you to properly and snugly fit smaller infants into the car seat.

Ease-of-Use for Safety and Convenience
Packed with perks for parents, the MARATHON 70 makes it easy to secure your child in the proper position without guesswork. Premium lower LATCH connectors make for a quick, simple, and tight installation, while the push-button allows you to easily uninstall the connectors. Easy-to-access built-in lock-offs allow you to install the car seat with ease using your vehicle's lap and shoulder belt. The quick-adjust harness system and buckle allow you to reposition the harness height without disassembling the harness straps.

Additionally, an anti-slip contoured base grips and protects the vehicle seat, ensuring a tight installation in all types of vehicles. Convenient holders keep harness straps out of the way when you're placing your child in the seat, and the plush cover set with matching pads removes easily for cleaning without requiring you to disassemble or uninstall the car seat.

The BRITAX MARATHON 70 Convertible Car Seat is backed by a one-year limited warranty.

What's in the Box
One BRITAX MARATHON 70 Convertible Car Seat and manual.


From the Manufacturer

The Britax Marathon 70 convertible car seat is designed for children rear facing from 5 to 40 pounds and forward facing up to 70 pounds. The Marathon 70 achieves revolutionary head safety through the use of patent-pending 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, five-point harness, a quick-adjust head restraint, 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 and infant positioning.

Customer Questions & Answers

Customer Reviews

My son loves it and seems very comfortable in it as well.
jonnysmom79
CONCLUSION Britax convertible car seats have advanced safety features and are consistently rated among the best.
Ed
Easy to adjust harness and headrest (no more rethreading the straps).
Luna87

Most Helpful Customer Reviews

127 of 134 people found the following review helpful By Kristen Stewart VINE VOICE on August 15, 2010
Color Name: - Onyx Vine Customer Review of Free Product ( What's this? )
We've been using Britax's older style Marathons for five years so I was anxious to try this latest manifestation to see how it stacked up. It is larger, but it now fits children up to 70 lbs forward facing (and 5-40 rear facing) and still fits easily in our Honda Odyssey and forward facing in our small VW Golf. Like the older Britax models, the new Marathon is often outgrown by height, rather than weight. I sat both of our children in it and found the difference to be slight, if any, over the old model, so if you are in the market for a new seat for child outgrowing the shell, this is probably not the best choice.

The legendary Britax quality continues with a solid, intuitive build. Some of the newer head protecting technology from other, more expensive Britax seats has been integrated. The new harness adjuster is amazing, making it so simple and easy to change the height of the straps. We often carpool and I'm glad I can quickly and easily customize the seat to every child.

Britax seats are always soft and comfortable for riders, so much so that my children notice the difference when they ride in other seats! My four year old gave this her seal of approval comfort-wise, declaring the new design even better than her old one.

There are new spots to store latch clips when they are not in use that I love, most every change is a great improvement with the exception of the locking mechanisms for using a seat belt. They are MUCH harder to use than they were on the older model Marathons. I assume that they are also safer, but I had such a hard time with it, I could imagine parents using it incorrectly (and unsafely.
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120 of 127 people found the following review helpful By Amazon Customer VINE VOICE on August 5, 2010
Color Name: - Onyx Vine Customer Review of Free Product ( What's this? )
Overall I feel that all car seats properly installed provide an extraordinary level of protection that we never had as children. So I have bought all sorts of car seats between 2 kids and 2 cars from snap-in travel systems to boosters, and from economy models to plush models. This is what I found that separates them convenience and materials.

The seats that cost less than $100 usually have little padding and are made from just enough plastic and foam as necessary. Pretty much all the adjustments are manual from shoulder height to anchor clips to strap length. The nice thing other than the price is that they are usually dead simple to install and very light.

The seats that cost more than $100 but less than $200 are usually very well padded and come with a lot of conveniences such as reclining, cup holders, mechanical strap adjustments, extra weight maximums. They're still usually plastic and foam, but a lot more of it. I do find that they can also be more difficult to work with, because with all their conveniences and padding the rare mechanical adjustments (installation and shoulder adjustments) are harder to perform. Also, I don't feel that seats I have in this class are any safer than my economy seats just more comfortable.

Now once we get over $200 we find ourselves in Britax Marathon 70 country... This is a very well appointed car seat in terms of comfortable padding, conveniences, and materials. You notice it's different once you see the steel beams supporting it, then as you use it and find the shoulder height can be adjusted without rethreading while installed (which is also a breeze), and that the recline doesn't require great force, and that there's Velcro to hold the straps back if you want it to and many other small touches...
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38 of 38 people found the following review helpful By Ed TOP 100 REVIEWER on April 2, 2011
Color Name: - Onyx
Britax is one of the most trusted car seat manufacturer's around. They have been making convertible car seats for the US market since 1997. Never satisfied, Britax continuously improves their products to make them safer, easier to use, and more comfortable. In August of 2010, they released their new line of convertible car seats with many improvements. Having been a Britax customer since 2007, I was excited to see the improvements they made.

My Configuration:
2000 Jetta 4DR
Forward Facing
LATCH Install

PROS:
- Supports up to 70lbs forward-facing, and 5-40lbs rear-facing
- Supports infants with an infant positioning insert (sold separately)
- MUCH improved/easier harness height adjustment
- New integrated steel bars
- Serial number located in easy to find location
- Harness buckle can now be in two positions
- Comfort pads now removable
- Super easy LATCH installation
- Certified for air travel
- Consistently rated Very Good by Consumer Reports (though this model has not yet been tested by CR)

CONS:
- Expensive

On March 21, 2011, the American Academy of Pediatrics updated their recommendations for car seats. They now recommend that children stay in the rear-facing position until the age of 2, rather than their previous recommendation of 20lbs and 1 year of age. You can read the full press release and recommendations HERE. With these new recommendations, getting a car seat with better height and weight ratings become more important. Obviously the AAP recommendations are only recommendations and if your child exceeds the limits of the car seat, it's better to switch them to forward-facing even if not yet 2 years old.
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