Britax Marathon G4 Convertible Car Seat
By: Britax

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Packed with comfort and safety features, the Britax Marathon convertible car seat is constructed to provide 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. It offers a no-rethread and quick-adjust five-point harness and EZ-Buckle system for convenience when harnessing your child, and an easy-remove cover for quick clean-ups that also allows access to the belt paths from the front of the seat. The Marathon accommodates children rear facing from 5 to 40 pounds and forward facing from 20 to 65 pounds.
Head Safety Technologies For Advanced Protection

The base of the Marathon includes SafeCell Technology comprised of SafeCells, an engineered material designed to compress in a crash. This compression lowers the center of gravity to counteract forward rotation of the seat, helping to minimize the risk of head injury during a collision.Located in the sides of the seat shell, integrated steel bars strengthen the connection to the vehicle and prevent forward flexing of the seat during a crash to reduce the risk of head injury. In the event of a sudden stop, the Energy-Absorbing Versa-Tether strap restricts forward movement and reduces crash forces with patented staged-release webbing and a two-point attachment. This webbing securely anchors the top of your child seat to your vehicle in either rear- or forward-facing positions.
No-Rethread Harness System And Comfort Features

The tangle-free, five-point harness allows for multiple height positions and can be adjusted without dismantling the harness or removing the car seat from the vehicle. Two buckle positions provide a snug, comfortable fit as your child grows. The seat's harness holders prevent the straps from getting in the way when you're putting your child in the seat, while the EZ-Buckle system maintains the harness buckle in a forward position to prevent your child from sitting on it when first entering the seat. Rear- and forward-facing recline options, as well as high-density foam cushioning, help your child relax on the journey. And the plush cover comes with matching comfort pads and an infant positioning pillow to keep children of all ages comfortable and secure.

  • 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
  • Quick-Adjust Harness repositions the harness shoulder height without disassembling the harness straps
  • 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
  • HUGS (Harness Ultra Guard System) Chest Pads provide resistance to forward movement in the event of a crash
  • 65-pound 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
  • Easy-Remove Cover allows easy cleaning, without disassembling the harness or uninstalling the car seat
  • Two Buckle Positions for your growing child
  • EZ-Buckle System and Harness Holders keep harness straps out of the way when placing your child in the car seat
  • Premium Lower LATCH 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
  • Infant Positioning Pillow offers extra comfort while achieving proper harness fit for small infants
  • Certified for Aircraft Travel
  • Made in the USA with global components
Child Weight (lbs) Rear Facing: 5 - 40
Forward Facing: 1 year and 20, up to 65
Child Standing Height (in) 49 or less
Child Seated Shoulder Height (in) Rear Facing: 9 - 16.75
Forward Facing: 12 - 16.75
Product Weight (lbs) 19.5
Product Dimensions (in) 18.5W x 26H x 21D
Seating Compartment Height (in) 23.5
Seat Area Depth / Width (in) 11 / 11
Shoulder Width (in) 13
Harness Slot Heights (in) 8.5 / 9.5 / 10.5 / 11.5 / 12.5 / 13.5 / 14.5 / 15.5 / 16.5 / 17.5
Buckle Strap Depths (in) 5 / 7.5


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Pink Giraffe UPC: 652182711528 Model: E9LQ95K

Cowmooflage UPC: 652182711733 Model: E9LQ91Q

Kiwi UPC: 652182711740 Model: E9LQ93G

Onyx UPC: 652182711504 Model: E9LQ91A

Cactus Flower UPC: 652182720353 Model: E1A124N

Jet Set UPC: 652182720322 Model: E1A121E