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Britax Marathon 70 G3 Convertible Car Seat - SOLD OUT

The much-loved Britax Marathon gets a makeover with the Britax Marathon 70 G3 Convertible Car Seat.

Just like the original, the Britax Marathon 70 G3 is built on a shell with dimensions that are larger than the Britax Roundabouts. But even with the larger dimensions, the Marathon is still approved for use on aircraft and will fit perfectly in just about every car out there. Plus, its weight capacity is higher than it's predecessor.

Some standout features include the all-new EZ-Buckle System, four-position adjustable shoulder straps that are easy to change as your child grows, easy to install IsoFit LATCH buckles, easy to adjust recline system, and floating HUGS that enable easy chest clip placement and distributes the harness load to avoid webbing edge irritation to a child's neck in the event of a crash.

  • EZ-Buckle System - retains the harness buckle in a forward position and prevents the child from sitting on the buckle when boarding
  • Side-Impact Protection - distributes crash forces, shields from vehicle intrusion, and contains the head and body
  • 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
  • Patented Energy-Absorbing Versa Tether - staged-release to slow the forward movement, reducing the crash forces reaching the child
  • higher forward facing seat capacity allows children to remain harnessed up to 65 pounds
  • tangle-free, five-point harness with four harness heights for a snug and secure fit
  • premium push-button LATCH connectors for a quick, simple and tight installation
  • patented Versa-Tether anchors top of seat to minimize movement in a crash
  • rear-face tethering for seat stabilization
  • rear- and forward-facing recline for child comfort and positioning
  • energy-managing protective foam
  • high density comfort foam gently cushions the child
  • patented HUGS, Harness Ultra Guard System, reduces forward head movement and gently cushions the neck and chest
  • lift-lever front harness adjustment allows for a consistently snug harness fit
  • built-in lock-offs tightly secure the vehicle seat belt
  • convenient belt holders keep harness straps to the sides while placing child in the car seat
  • plush, washable cover with matching comfort and belly pads
  • contoured base for a perfect fit in most vehicles
Fit Chart:

  • weight: 5-40 lbs
  • height: 49 inches or less
  • seated shoulder height: 9 to 16.75 inches
  • weight: 1 year and 20 lbs - up to 70 lbs
  • height: 49 inches or less
  • seated shoulder height: 12 to 16.75 inches
  • seat: 19.5 W x 27.5 H x 25.5 D inches
  • interior seat: 11 W x 22.5 H inches
  • weight: 16.5 lbs

In stock and ready to ship, unless otherwise noted.
  • Shipping available to all 50 states
  • Sorry, this item cannot be shipped outside of the U.S.



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