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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- USA
• 100% Polyester

Product Notes

View All Britax Marathon G3 View All Britax View All Car Seats

Britax Marathon 70-G3 - Azalea

987 reviews
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$289.99 SALE

Description
Price
   
Britax Marathon 70-G3 - Azalea
$289.99
Discontinued by vendor
Britax Marathon 70-G3 - Chili Pepper
$214.99
Discontinued by vendor
Britax Marathon 70-G3 - Cowmooflage
$195.99 $289.99
Discontinued by vendor
Britax Marathon 70-G3 - Onyx
$238.09
Discontinued by vendor
Britax Marathon 70-G3 - Waverly
$199.99 $289.99
Discontinued by vendor
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REVIEW SNAPSHOT®

by PowerReviews
BritaxMarathon 70-G3 - Azalea
 
4.7

(based on 15 reviews)

100%

of respondents would recommend this to a friend.

Pros

  • Durable (15)
  • Stylish (14)
  • Comfortable (13)
  • Easy to adjust (13)
  • Safe (13)

Cons

  • Heavy (6)
  • Heavy / bulky (4)
  • Hard to install (3)

Best Uses

  • Toddler (13)
  • Infants (9)
    • Reviewer Profile:
    • First time parent (8), Parent of two or more children (5)

Reviewed by 15 customers

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Displaying reviews 1-15

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5.0

Another great Britax car seat

By Dani1975

from Centreville, VA

About Me Parent of Two or More Children

Verified Buyer

Pros

  • Attractive Design
  • Comfortable
  • Easy to Assemble
  • Sturdy

Cons

    Best Uses

    • Infants
    • Toddlers

    Comments about Marathon 70-G3 - Azalea:

    I purchased this car seat for my 6 month old daughter when she started getting fussy in her Britax infant car seat. The infant car seat was not offering her as much room as she would have liked. Her new car seat is super comfy with ample padding and feels very safe in our 2011 Toyota Sienna. I was able to install the car seat within 5 minutes and it is very easy to get her in and out of the car seat. The only drawback of the switch is this carseat offers no sunshade, which the infant seat had. This is one of the safest car seats on the market and looks to be one of the most comfortable too. She should be able to use this one until she needs a booster.

    Comment on this review

     
    5.0

    First Britax - love it!

    By ingrid77

    from Houston, TX

    About Me Parent of Two or More Children

    Pros

    • Comfortable
    • Easy to Adjust
    • Easy to install
    • Lightweight
    • Sturdy
    • Stylish

    Cons

      Best Uses

      • Toddlers

      Comments about Marathon 70-G3 - Azalea:

      I was skeptical about going Britax because of the cult-like following, but I love this car seat! It's so much lighter than my previous seat (the Chicco convertible). The print is super-cute and not overpowering. Installation is easy, getting my daughter in and out is easy. I like the Velcro on the sides that holds the straps out of the way and I like that the sides of the seat are low, so that I don't have to throw her over the side or drag her out like I used to. She has a lot more breathing room in this seat. The fabric is comfy. The buckles are easy to undo, no nail-breaking involved! I'm officially a Britax fan now.

      Comment on this review

       
      5.0

      So far..so good!

      By Gran

      from Georgia

      About Me Grandparent

      Verified Buyer

      Pros

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

      Cons

      • Heavy

      Best Uses

      • Toddlers

      Comments about Marathon 70-G3 - Azalea:

      Just converted our 1 yr old granddaughter to her 'big girl' car seat. Wanted the safest on the market!!
      * Very easy to install even though it is heavy.
      * Easy to adjust the shoulder straps
      Our only problem and just because she is small (about 17 lbs),the sides are very high and she can not see the other people stitting near her. Of course this is not going be a problem as she grows & is forward facing but just saying for now...
      Love the color; it is not a bright pink but still girly.
      She seems to love it and expect this one car seat to last her until booster seat time.

      Comment on this review

       
      5.0

      Cute & Comfortable for the Babe

      By Mama M.

      from Logan UT

      About Me First Time Parent

      Verified Buyer

      Pros

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

      Cons

      • Heavy

      Best Uses

      • Infants
      • Toddlers

      Comments about Marathon 70-G3 - Azalea:

      This Britax was easy to install and the pattern is adorable! I'm not a pink person and I love it! It is super cushioned and comfortable for my sweet little lady.

      Comment on this review

       
      5.0

      Great car seat

      By Liz

      from Cleveland, OH

      About Me First Time Parent

      Verified Buyer

      Pros

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

      Cons

        Best Uses

        • Infants
        • Toddlers

        Comments about Marathon 70-G3 - Azalea:

        I read other reviews that said the seat was big, and it is, but it's comfy for my 10 month daughter and is extremely sturdy and well built. Best if you can catch it on sale as I did. Worth every penny!

        Comment on this review

         
        5.0

        Love this carseat!

        By Ashley

        from Cape Cod, MA

        About Me Parent of Two or More Children

        Verified Buyer

        Pros

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

        Cons

        • Heavy

        Best Uses

          Comments about Marathon 70-G3 - Azalea:

          I recently purchased this car seat for my 9 month old daughter as she is growing out of her infant carrier. I read numerous reviews on different car seats and the Marathon consistently had the best ratings. I can see why. It is a beast. It is solidly made, has lots of padding, and looks super comfy to ride in. We currently have it rear facing and reclined. I love that this will probably be the only car seat we need to purchase as it holds up to 70 lbs (our 6 year old doesn't even weigh that much!) Also, this is the cutest print EVER!

          Comment on this review

           
          5.0

          Very safe and plush!

          By Baby B's momma

          from Seymour, TN

          About Me First Time Parent

          Verified Buyer

          Pros

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

          Cons

          • Hard to Install

          Best Uses

          • Infants
          • Newborn
          • Toddlers

          Comments about Marathon 70-G3 - Azalea:

          I originally saw this as Mommy's Best Pick on a baby center survey so thats how i started looking at this male and model. We bought this as a second carseat for our second vehicle. I was tired of taking out and carrying the other one we have. Great thing about this car seat is my daughter is comfortable while safe and she can see out window now. She is 9 months old (17 lbs)and drifts off to sleep more often in this new car
          seat. What is not so great is it took a bit of time to install, but that is part of what makes it so safe. Tip: install it ahead of needing it(don't try to do it before you need to be somewhere.) It is made ofvery nice material and soft safe straps! I wish we would've bought it sooner! Delivery was super fast!!!

          Comment on this review

          (1 of 1 customers found this review helpful)

           
          5.0

          Love my Britax!

          By Virginia

          from Dothan, AL

          About Me First Time Parent

          Verified Reviewer

          Pros

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

          Cons

          • Retains HEAT

          Best Uses

          • Infants
          • Newborn
          • Toddlers

          Comments about Marathon 70-G3 - Azalea:

          Even though this car seat is rather large, it sits perfectly in the middle of my back seat ('10 Malibu). Both seats are still able to fully recline and slide back. The size is actually a plus because it allows your baby to stay in it longer. Also I just feel it's safer in general than a smaller seat. This is one of the only convertible seats I've found that can hold a newborn up to well past a toddler. The money is worth it because it's the only seat you'll ever need to buy! I love the ease of not having to rethread the harness to adjust height/tighten the straps. The seat was very easy to install with the anchor system. It tightened right down and doesn't move an inch. I had to get my sister to install it though, because I was 8 months pregnant when I bought it and it's best to actually sit in the seat while you tighten it to get the best results. I was not fitting in there at 8 months pregnant! I know a lot of people opt for the smaller seats with newborns for the fact that you have a base and can easily remove the seat take it with you. Which is not the case with this Britax. I, on the other hand, did not want to, and probably could not, carry around a car seat post c-section. A lot of those people will tell you, too, that carrying it, along with a diaper bag got really heavy and became a hassle. Trust me, it was a lot easier to just start off with the big one and cheaper too! The ONLY thing, which is not really something you can help in south Alabama, is when it's warm, the seat makes my baby sweat. Not all the seat's fault, but the padding is kinda thick so it retains heat. All around I LOVE this seat. My daughter has used it since day 1 and is almost 4 months old. Best thing since sliced bread if you ask me!

          Comment on this review

           
          5.0

          Love this Car Seat!

          By LadyLiteracy

          from Pennsylvania

          About Me First Time Parent

          See all my reviews

          Verified Buyer

          Pros

          • Comfortable
          • Easy to Adjust
          • Easy to Clean
          • Easy to install
          • Lightweight
          • Safe
          • Sturdy
          • Stylish

          Cons

            Best Uses

            • Toddlers

            Comments about Marathon 70-G3 - Azalea:

            Had one of these before and had to replace it because of a car accident. The old seat protected my daughter so well that she had absolutely no injuries, yet my car was totaled. Just bought this one, love the color, she feels like a princess in it. Love the Velcro on the sides that holds the seat belts when she gets into it. It's a small thing, but is really convenient. Bought the cup holder too, easy for her to reach and use. A few other updates made it even better. I will never buy a seat other than Britax and I recommend it to all of my friends.

            Comment on this review

             
            2.0

            Way too big!

            By HBmom

            from Rosamond CA

            About Me First Time Parent

            See all my reviews

            Verified Buyer

            Pros

            • Comfortable
            • Safe
            • Sturdy
            • Stylish

            Cons

            • Bulky
            • Difficult to Set Up
            • Heavy

            Best Uses

            • Toddlers

            Comments about Marathon 70-G3 - Azalea:

            I loved all the safety features this car seat had too offer but in the end it was huge!!! I had to return it because it would not fit into our dodge magnum.

            Comment on this review

             
            4.0

            Perfect for Twin Girls

            By Twincesses Mom

            from Springfield, VA

            About Me Parent of Multiples (Twins etc)

            Verified Buyer

            Pros

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

            Cons

            • Bulky
            • Heavy

            Best Uses

            • Toddlers

            Comments about Marathon 70-G3 - Azalea:

            We just purchased two of these for our 13 month old twin girls. They both love them as they are roomy and I think comfortable for them. Much better than their old infant carriers. For me it's not about the price when it comes to my girls safety and Britax makes some solid safe items. My only complaint about "any" make convertible seat is that they don't come off the base. I have to lug two of these heavy things in and out of daycare daily because it's state mandate that I leave them at the daycare. Other than that I LOVE the color and the fact that the cover comes off and is machine washable. So far this car seat is a winner!

            Comment on this review

             
            5.0

            Best car seat

            By Col

            from CT

            About Me First Time Parent

            Verified Buyer

            Pros

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

            Cons

              Best Uses

              • Infants
              • Toddlers

              Comments about Marathon 70-G3 - Azalea:

              When my daughter outgrew her infant carrier, I needed to purchase another rear facing seat. I purchased a different brand first and after not being fully satisfied with it, I did some more research and purchased this one since it always appears to come out on top. I couldn't be happier with it so far and my daughter appears to be very comfortable in it. It is also very sturdy and has a secure fit. I highly recommend this seat.

              Comment on this review

               
              5.0

              Quick delivery!

              By MEST

              from San Diego ca

              About Me Parent of Two or More Children

              Verified Buyer

              Pros

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

              Cons

                Best Uses

                • Infants
                • Toddlers

                Comments about Marathon 70-G3 - Azalea:

                My daughter is 13 months and I'm keeping her rare facing as long as I possibly can. She has not been loving that but as soon as we put this seat in she got all cozy and did not want out! Love the two day delivery!

                Comment on this review

                 
                5.0

                Great Item!

                By Laur

                from Sanford, NC

                About Me First Time Parent

                Verified Buyer

                Pros

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

                Cons

                • Bulky
                • Hard to Install
                • Heavy

                Best Uses

                • Infants
                • Toddlers

                Comments about Marathon 70-G3 - Azalea:

                I love this car seat! My daughter is comfortable when she is in it and it looks great in my car. This seat has velcro on the shoulder straps to make putting her in a breeze. I never have to pull and yank on the straps because they have gotten under her. The safty features are what made my decision to purchase this brand very easy. The only problem I have with it is that if you do not have the bottom anchors in your car, installing and moving this seat to another vechicle is very annoying.

                Comment on this review

                (0 of 1 customers found this review helpful)

                 
                5.0

                love it already

                By proud momma of 4 girls

                from kingman az

                About Me Parent of Two or More Children

                Verified Reviewer

                Pros

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

                Cons

                • Bulky
                • Hard to Install

                Best Uses

                • Infants

                Comments about Marathon 70-G3 - Azalea:

                Just got this car seat yesterday for my 5 month old I absolutly love it its so easy to adjust the straps unlike with our last seat there is no rethreading you just slide it up or down to your babys height and pull the button and pull the straps to loosen its so comfortable a little bulky but its worth it to know your baby is safe and its not really heavy like our last carseat we had the sunshine kids radian 80

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