BritaxMarathon ClickTight Convertible Car Seat



No Longer Available On Babylist

color: Twilight--DISCONTINUED

What weabout it
This is an easy-to-use convertible car seat to grow with your child from toddlerhood into their booster seat.

About this Product
  • 5 - 65 lb weight range
  • 7-position recline
  • 12-position no rethread harness
  • ClickTight makes seat belt install easy
  • Clear indicator to ensure proper installation


Britax is most known for their infant car seat the B-Safe 35, and the Marathon is a convertible seat for your baby to graduate to around one year when they outgrow their infant seat. (You can also start with the convertible car seats and skip the infant one altogether. Make an informed choice.)

Since your child has to stay in a convertible car seat until they are four years old, the Marathon ranges from 5-40 lbs in the rear-facing position and from 20-65 lbs in the forward-facing position and up to 49” tall.

The seated shoulder height limit of the Marathon is on the shorter side: 16.95”. Britax’s other convertible car seats–the Advocate and the Boulevard–allow up 18.65”. Since your child will move from this convertible into a booster seat anyway, this height limitation is probably not an issue. (If you know you’ll be having a taller baby, consider the other two options which are a bit pricier.)

The Marathon has clip-style LATCH anchors that are easy to use. The seven-position recline allows you to correctly level the seat, and it has an indicator to show if it’s installed in the right position. You cannot adjust the recline while the child is in the seat, like you can with some Graco convertibles. You have to uninstall the car seat to reset the recline.

Once your child is more than 40 lbs (between four and five years), you’ll need to attach the car seat using seat belts, not LATCH. On the Marathon, you have to remove some of the seat padding to get to the belt path, but then the ClickTight system makes securing the seat belt pretty easy. It clamps right down on the seat belt once you thread it through the base.

Britax ClickTight car seats are also known for their V-shaped tether that connects to a LATCH anchor behind the seat and helps stabilize the car seat in the forward-facing direction.

The no-rethread adjustable harness is really simple to use and has twelve positions to grow with your child. The car seat cover is easy to remove, too, but it can only be hand washed.

There are three other differences between the Marathon and the higher end Britax options. The Marathon does not have the additional side impact protection head restraint. It meets all federal highway safety rules, but it does not have that above-and-beyond protection. The other options have a “Click & Snug” harness indicator, where the harness tightener clicks when you get it tight enough around the baby. Also, you cannot add an anti-rebound bar to the Marathon. This is used only in the rear-facing position, so its use with convertible car seats is limited.

Overall this is a well-priced, easy-to-use convertible car seat to carry your child from toddlerhood into their booster seat.


  • Car seat weight: 28.5 lbs
  • Car seat dimensions: 18.5” x 23.5” x 23”
  • Includes removable pillow
  • Car seat cover is hand wash only

Rear-facing Mode:

  • Child weight range: 5-40 lbs
  • Child height limit: 49”

Forward-facing Harness Mode:

  • Child weight range: 20-65 lbs
  • Child height limit: 49”

Related Videos

Related Products

User Reviews (2)

Have advice you’d like to share about this product?

Write a Review

September 17, 2018

Easy to use, super safe and grows as our child grows.

February 25, 2018

Literally the EASIEST installation ever. Super sturdy. Absolutely love this seat and I researched for months for the one that would work best for us. We started with this seat, we didn’t use and infant one, and our daughter loves it. I would recommend this seat time and time again.