By Britax

More Views


By Britax


* Required Fields


Availability: In Stock, Available to Ship Now
Eligible for Free Shipping! details

Reserve in store is now available at all of our locations. Choose a store closest to you!


Return Policy: This is a final sale item. No exchanges or returns.

Britax Marathon Convertible Car Seat.

Base with 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 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 the forward movement, reducing the crash forces reaching the child, and a two-point attachment to minimize forward rotation while anchoring the top of the child seat

Additional Information

Additional Information

  • Anti-rebound bar to limit child seat rotation in a crash when installed rear facing.
  • Easy-Remove Cover allows easy cleaning without disassembling the harness or uninstalling the car seat
  • 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
  • Tangle-Free, Five-Point Harness distributes crash forces across the strongest parts of the body and provides a secure fit
  • Harness Ultra Guard System (HUGS) provides resistance to forward movement in the event of a crash
  • 65 lb (29.4 kg) Weight Capacity for safety and comfort as your child grows
  • Rear and Forward Facing Recline for child comfort and positioning
  • High Density Comfort Foam provides an extra layer of padding to gently cushion your child
  • Two Buckle Positions for your growing child
  • Quick-Adjust Harness repositions the harness shoulder height without disassembling the harness straps
  • Premium LUAS Connectors for a quick and simple installation featuring a push button for easy release
  • Built-in Lock-Offs ensure a snug lap and shoulder belt installation with minimal effort
  • Anti-Slip, Contoured Base grips and protects the vehicle seat while offering optimum vehicle fit
  • EZ-Buckle System keeps buckles and straps out of your way when placing your child in the car seat.
  • Infant Positioning Pillow offers extra comfort while achieving proper harness fit for small infants

Car Seat expires 7 years from Date of Manufacturing

Customer Reviews 2 Review(s)

2 Item(s)

Excellent product with even better and fast service!
I was nervous when it came time to get my first baby out of the infant seat to a convertable car seat but having the product details right here on the site was fantastic and helped me pick a great seat. The colour is exactly what we wanted and the quality is really great! Ordering was a breeze. I even specified that i wanted the most recent manufacturer's date and was taken care of. Fantastic competitive price and fast shipping! Love it.
Review by Tania / (Posted on 2016-10-19)
Comfortable Carseat
We own 3 of the Britax Marathon Carseats. We love them and find that the children feel really comfortable in them.
The only thing that we did notice was the seatbelt harness did begin to fray after 1 year of little use (as it was in the secondary car) with one of three carseats. We called Britax and they sent us a new seatbelt harness to replace the frayed one.
Review by Sarah / (Posted on 2015-10-19)

Write Your Own Review

Only registered users can write reviews. Please, log in or register