Britax Marathon vs Britax Decathlon

Not open for further replies.


New member
:confused: Hi, I was checking out the new Britax webside. I see that the Decathlon is a true side impact seat and the Marathon isn't. Other than the extra seat pads (which you have to take out when baby is bigger) what exactly is the difference between the two? Does the Decathlon have thicker styrofoam in the seat? I wish the site had a side by side comparison. How many sets of shoulder slots does the Decathlon have? Does anyone out there know the difference between the two? Thanks


New member
You know I dont know why they put that on the DC because it doesnt have any added SIP. It has the same shell as the MA, the only difference is the extra padding for infant, the FF lockoff that isnt nice, 3 crotch positions instead of 1(and they move inward not outward so really to accomodate an infant), and the push button harness adjuster(and maybe a few tiny things Im missing).
If you want SIP Id get the boulevard, otherwise if you arent using it from birth Id get the marathon.


New member
Since Britax revamped their whole website recently there's been quite a few mistakes in product descriptions. Some have been corrected, I think--but not this one. The Boulevard is the convertible with TSIP.
Not open for further replies.

Car-Seat.Org Facebook Group

Forum statistics

Latest member

You must read your carseat and vehicle owner’s manual and understand any relevant state laws. These are the rules you must follow to restrain your children safely. All opinions at Car-Seat.Org are those of the individual author for informational purposes only, and do not necessarily reflect any policy or position of Carseat Media LLC. Car-Seat.Org makes no representations as to accuracy, completeness, currentness, suitability, or validity of any information on this site and will not be liable for any errors, omissions, or delays in this information or any losses, injuries, or damages arising from its display or use. All information is provided on an as-is basis. If you are unsure about information provided to you, please visit a local certified technician. Before posting or using our website you must read and agree to our TERMS.

Maxi Cosi is a proud sponsor of Car-Seat.Org!Graco is a Proud Sponsor of Car-Seat.Org!

Please  Support Car-Seat.Org  with your purchases of infant, convertible, combination and boosters seats from our premier sponsors above.
Shop travel systems, strollers and baby gear from Britax, Chicco, Clek, Combi, Evenflo, First Years, Graco, Maxi-Cosi, Nuna, Safety 1st, Diono & more! ©2001-2020 Carseat Media LLC