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Product Information

Britax Marathon 70-G3 - Onyx

The Marathon 70-G3 achieves revolutionary head safety through the use of Britax SafeCell Technology in the base, integrated steel bars, and energy absorbing Versa-Tether that work together to minimize head excursion and reduce the risk of head injury during a frontal impact. The Marathon 70-G3 also incorporates Britax Side Impact Protection, offers a no-rethread and quick-adjust five-point harness, multiple buckle and recline adjustments, and an easy-remove cover that also allows access to belt paths from the front of the seat. A head and body pillow is provided for extra comfort and infant positioning.

Features:

  • 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 forward movement
  • 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
  • Harness Ultra Guard System (HUGS) provides resistance to forward movement in the event of a crash
  • Plush, easy-remove cover with matching comfort pads and infant body pillow
  • Infant Positioning Insert may be necessary for small infants to achieve a snug fit (sold separately)
  • No-rethread, 5-point harness repositions the harness shoulder height without disassembling straps
  • Premium Lower LATCH Connectors for a quick and simple installation featuring a push button for easy release
  • Certified for Aircraft Travel

Manufacturer Recommended Weight/Height Limits:

  • Rear facing:From 5 to 40 pounds
  • Forward facing: From 20 to 70 pounds
  • Height:Up to 49 inches

Product Dimensions:

  • Weight:19.5 pounds
  • Depth/Width/Height:21 x 18.5 x 26 inches

• Made in the USA and Imported- Made in the USA and Imported
• 100% Polyester

Product Notes

Popularity: #15 in Car Seats
View All Britax Marathon G3 View All Britax View All Car Seats

Britax Marathon 70-G3 - Cowmooflage

822 reviews
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  • Britax Marathon 70-G3 - Cowmooflage
  • Britax Marathon 70-G3 - Cowmooflage
  • $195.99 $289.99
  • Discontinued by vendor
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  • Britax Marathon 70-G3 - Azalea
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  • Britax Marathon 70-G3 - Chili Pepper
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  • Britax Marathon 70-G3 - Onyx
  • Britax Marathon 70-G3 - Onyx
  • $238.09 $289.99
  • Discontinued by vendor
  • Britax Marathon 70-G3 - Waverly
  • Britax Marathon 70-G3 - Waverly
  • $199.99 $289.99
  • Discontinued by vendor
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Review Snapshot

REVIEW SNAPSHOT®

by PowerReviews
BritaxMarathon 70-G3 - Cowmooflage
 
4.6

(based on 19 reviews)

95%

of respondents would recommend this to a friend.

Pros

  • Durable (16)
  • Comfortable (13)
  • Attractive (8)
  • Easy to adjust (6)
  • Easy to assemble (6)

Cons

  • Heavy (3)

Best Uses

  • Toddler (13)
  • Infants (9)
  • Newborn (4)
  • Preemies (3)
    • Reviewer Profile:
    • First time parent (9), Parent of two or more children (6), Grandparent (3)

Reviewed by 19 customers

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Displaying reviews 1-15

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(0 of 1 customers found this review helpful)

 
1.0

Impossible to adjust Harness

By Jgram

from Western PA.

About Me Grandparent

See all my reviews

Pros

  • Comfortable
  • Sturdy

Cons

  • Difficult To Adjust

Best Uses

  • Infants

Comments about Marathon 70-G3 - Cowmooflage:

Impossible to get enough slack in the harness to accommodate 40 in. / 40# child wearing a light coat. Suggestion from Customer Service to take the coat off the child and just cover her with it. Sorry, but standing in a Boston parking lot removing my child's snowsuit so she can use this seat is ridiculous. As there is no solution to this silly situation , I now have the hassle of returning a seat bought on line and looking for a manufacturer that understands children's sizing. To suggest a totally ludicrous solution as removing your child's coat has left me speechless. Do not buy this seat unless you expect your child to stop growing at 25 or 30 # .

Comment on this review

 
5.0

Awesome Car Seat!

By Mommy71413

from Holden, MA

About Me First Time Parent

Verified Buyer

Pros

  • Easy to Adjust
  • Easy to install
  • Safe
  • Sturdy
  • Stylish

Cons

    Best Uses

    • Infants
    • Toddlers

    Comments about Marathon 70-G3 - Cowmooflage:

    I love Britax car seats. I had Graco car seats before I discovered Britax. I always felt the Graco did not strap into the car secure enough. It was always wiggling. I found out about Britax and read the reviews, ratings, and philosophy behind it. I spent the extra money and bought one. I was amazed at how secure the seat straps into the car. I put all my weight on the seat to try and make it move and it would not budge. This gives me a piece of mind knowing my daughter is safe in the car. The cowmooflage print rocks in my opinion especially if you are looking for something a little different!

    Comment on this review

     
    5.0

    Love diapers.com!

    By Amela

    from Oxford, MA

    About Me First Time Parent

    Pros

    • Easy to Adjust
    • Easy to install
    • Safe
    • Sturdy
    • Stylish

    Cons

      Best Uses

      • Infants
      • Toddlers

      Comments about Marathon 70-G3 - Cowmooflage:

      I bought this car seat for my mom to use with my 7 month old daughter. I have a Britax B-Safe infant seat and love it, so for a convertible seat I knew I wanted a Britax as well. Just can't beat the safety features in my opinion. After hours of research on which Britax to get, I chose the Marathon. It fits great in her Pontiac Vibe (rear facing) and looks great too. Installation was easy enough - I downloaded a free level app to my phone to double check the position. All in all took 10 minutes to install. Very sturdy and snug in the center back seat. Love the cowmooflage print! T

      Comment on this review

       
      5.0

      love it!

      By mom of 2

      from nc

      About Me Parent of Two or More Children

      Verified Buyer

      Pros

        Cons

          Best Uses

            Comments about Marathon 70-G3 - Cowmooflage:

            Great for my SUV..and my daughter is very comfortable in it. Easy to
            Install. A little pricey but it's the last seat you will buy bc of 70 lb limit.

            Comment on this review

             
            5.0

            I love this seat!

            By Okiemama

            from Oklahoma

            About Me Parent of Two or More Children

            Verified Buyer

            Pros

            • Attractive Design
            • Comfortable
            • Compact
            • Easy to Assemble
            • Sturdy

            Cons

              Best Uses

              • Infants
              • Newborn
              • Preemies
              • Toddlers

              Comments about Marathon 70-G3 - Cowmooflage:

              This carseat is great. It's not huge and bulky like most other brands. My toddler loves it! I used the cowmooflage carrier so naturally I had to get the cowmooflage for this one. It was more than I expected though, the seat is super soft and cushiony and the fabric is velvety!! I'm so glad I purchased this carseat :)

              Comment on this review

              (1 of 1 customers found this review helpful)

               
              4.0

              Tried and True

              By AllNaturalMomma

              from Washington DC

              About Me First Time Parent

              Verified Buyer

              Pros

              • Comfortable
              • Sturdy

              Cons

              • Hard to Assemble
              • No Strap Covers Received

              Best Uses

              • Toddlers

              Comments about Marathon 70-G3 - Cowmooflage:

              Great car seat from a trusted company proven to be just as great as our BSafe we used until now. Just completed a 400 mile road trip (each way) with our son and he was comfortable the entire way. It was more timely to install than the BSafe, but the safety and security are worth the time spent. After one time installing it into our SUV, all other times were very quick. The fabric of this make is very soft and comfortable.

              Comment on this review

               
              5.0

              Excellent Car Seat

              By mamo

              from Oklahoma

              About Me Grandparent

              Verified Buyer

              Pros

              • Attractive Design
              • Comfortable
              • Sturdy

              Cons

              • Heavy

              Best Uses

              • Toddlers

              Comments about Marathon 70-G3 - Cowmooflage:

              Car seat is easy to install and use. it's very well padded and seems comfortable for baby. The cow spots are adorable!

              Comment on this review

               
              4.0

              Great Car Seat

              By Lisa G.

              from Pelham, NY

              About Me Parent of Two or More Children

              See all my reviews

              Verified Buyer

              Pros

              • Easy to Adjust
              • Easy to install
              • Safe
              • Sturdy
              • Stylish

              Cons

                Best Uses

                • Toddlers

                Comments about Marathon 70-G3 - Cowmooflage:

                Love the fabric, very stylish and plush, easy to install. My 15 month old loves it.

                Comment on this review

                 
                4.0

                Great seat so far

                By Fitness mom

                from Denver, CO

                About Me First Time Parent

                Verified Buyer

                Pros

                • Comfortable
                • Easy to Adjust
                • Safe
                • Sturdy
                • Stylish

                Cons

                • Heavy

                Best Uses

                • Infants
                • Toddlers

                Comments about Marathon 70-G3 - Cowmooflage:

                Bought for my son who outgrew infant seat; seems very durable and well built. Restraints are easy to use and you can cinch it down tight [in the car] This carseat was recommended to me by another mom. I actually wish I would have moved to this type of convertible carseat sooner than I did.

                Comment on this review

                (0 of 1 customers found this review helpful)

                 
                4.0

                I have bought this product again!

                By Grams

                from Florida

                About Me Grandparent

                Verified Buyer

                Pros

                • Attractive Design
                • Comfortable
                • Sturdy

                Cons

                  Best Uses

                    Comments about Marathon 70-G3 - Cowmooflage:

                    I have purchased 2 for my grandson. The kids love it for him. The carseat is great.

                    Comment on this review

                     
                    5.0

                    Amazing carseat!

                    By SophieAnn's mom

                    from Washington

                    About Me First Time Parent

                    Verified Buyer

                    Pros

                    • Attractive Design
                    • Comfortable
                    • Easy to Assemble
                    • Sturdy

                    Cons

                      Best Uses

                      • Infants
                      • Transition

                      Comments about Marathon 70-G3 - Cowmooflage:

                      Have only used as rear facing but so far I love this seat and my 8 month old does too. Wish I would of bought sooner.. We had to switch from a regular infant seat since she was getting too tall. First time we used it we had to go two hours to the airport to pick up some family then drive two hours back home and my daughter loved riding in this seat. She was happy and comfy in this roomy seat. And it fits great in my jeep. So far no complaints!

                      Comment on this review

                       
                      5.0

                      Love

                      By mom

                      from Omaha, Ne

                      About Me First Time Parent

                      Verified Buyer

                      Pros

                      • Attractive Design
                      • Comfortable
                      • Compact
                      • Easy to Assemble
                      • Sturdy

                      Cons

                        Best Uses

                        • Toddlers

                        Comments about Marathon 70-G3 - Cowmooflage:

                        This car seat if very easy to get my child in and out of. That is one of the most important things to me besides safety. It also is very easy to install and my child seems very comfortable to my child.

                        Comment on this review

                         
                        5.0

                        Awesome, safe & cool!

                        By Terordktyl

                        from Cortlandt Manor, NY

                        About Me Parent of Two or More Children

                        Verified Buyer

                        Pros

                        • Attractive Design
                        • Comfortable
                        • Compact
                        • Easy to Assemble
                        • Sturdy

                        Cons

                          Best Uses

                          • Toddlers

                          Comments about Marathon 70-G3 - Cowmooflage:

                          It's great! It's a perfect match with our chaperone infant seat & it's one of the safest & highest rated seats. Trust is Britax!

                          Comment on this review

                           
                          5.0

                          Great seat!

                          By Stasi

                          from Morristown, NJ

                          About Me First Time Parent

                          Verified Buyer

                          Pros

                          • Attractive Design
                          • Comfortable
                          • Easy to Assemble
                          • Sturdy

                          Cons

                            Best Uses

                            • Toddlers

                            Comments about Marathon 70-G3 - Cowmooflage:

                            Very good quality! Much more comfortable than the Britax we bought a year ago.

                            Comment on this review

                            (0 of 1 customers found this review helpful)

                             
                            5.0

                            Good Car Seat

                            By MiniMini

                            from Philadelphia

                            About Me First Time Parent

                            See all my reviews

                            Verified Buyer

                            Pros

                              Cons

                                Best Uses

                                  Comments about Marathon 70-G3 - Cowmooflage:

                                  I would recommend watching the Britax install video - you will probably pool noodles if you are installing before acing.

                                  I was a little shocked w i received the car seat - there's a yellow/gold'ish lines that are part of the pattern that do not show online.

                                  Comment on this review

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