Britax G4 Series is an update on the Britax 70-G3 series with a few changes and improvements while remaining structurally similar

Britax G4 Series

Britax G4 SeriesBritax is a UK based company that started making car seat in the 70s. It is the bestselling brand in Europe, building a great reputation in the USA since 1996.

In late 2013, Britax updated their convertible car seats from the 70-G3 series to the Britax G4 line. Both generations are structurally very similar, with a few changes and improvements in the Britax G4 series.

Specifications for all convertible car seats in the Britax G4 series are as follows:

  • Rear Facing Weight of 5 to 40 lbs
  • Forward Facing Weight from 1 year & 20 up to 65 lbs
  • Rear Facing Seated Shoulder Height of 9” to 16.75”
  • Forward Facing Seated Shoulder Height of 12” to 16.75”
  • Height of 49” or less


Changes and Improvements in Britax G4 Series


The 70 has been removed from the name after the listed weight limit has been decreased from 70 to 65 pounds due to stricter vehicle safety testing standards implemented by the NHTSA in 2014.



The Britax G4 Convertible Car Seats include an infant positioning pillow which must be used up to 22 pounds before it can be removed. The pillow ensures infants are fitted to the harness properly.

There is an update in the HUGS design, i.e., wavy patterns were added to the front for prevention of children from moving the chest clips up or down on their own.

Britax G4 Series Fashion


Britax has stitched a handy indicator line on the seat for maximum shoulder height, showing at a glance when a child has outgrown the seat rear-facing and should be installed forward-facing.

The informational seat stickers have been color coded in the Britax G4 line to make them easier to check at a glance, i.e., blue for rear-facing info, green for forward-facing and red for booster seat. This is primarily to keep parents from having to dig out the instruction manual.


Dimensions and Weight

The Britax Advocate G4 has been slimmed down a bit, from a width of 22” to 20.5”, for freeing up some room in the back seat for car passengers or additional car seats while the Britax Roundabout G4 has dropped weight from 20.8 lbs to 17.6 lbs, for a welcome change should travel with it is planned.


Britax Roundabout G4

Britax G4 Series Britax Roundabout G4While the Britax Roundabout G4 is on the lower end of Britax car seats in terms of safety and price, it does not suggest it’s not being safe by any means.

The Britax Roundabout G4 provides the following features:

  • Base with SafeCell Technology
  • Integrated Steel Bars
  • Energy-Absorbing Versa-Tether
  • Side Impact Protection
  • Quick-Adjust, No-Rethread Harness
  • Premium Lower LATCH Connectors
  • Five-Point Harness
  • Comfort Foam
  • Rear and Forward Facing Recline
  • Easy-Remove Cover
  • Multiple Buckle Positions
  • EZ-Buckle System and Harness Holders
  • Built-in Lock-Offs
  • Anti-Slip, Contoured Base
  • Convertible Car Seat Design


Britax G4 Series Britax Marathon G4

Britax Marathon G4

The Britax Marathon G4 is an entry level convertible seat.

In addition to the features enumerated for the Britax Roundabout G4, the Britax Marathon G4 offers HUGS a.k.a. Harness Ultra Guard System Chest Pads and an additional foam layer for Side Impact Protection.

Britax G4 Series Britax Boulevard G4

Britax Boulevard G4

The Britax Boulevard G4 is a mid-range premium convertible car seat.

It comes with the HUGS Chest Pads with SafeCell technology instead of the HUGS Harness Ultra Guard system of the Britax Marathon G4 and True Side Impact Protection instead of the Side Impact Protection of the Britax Marathon G4.


Britax Pavilion G4Britax Pavilion G4

The Britax Pavilion G4 is the next seat down from the top of the Britax G4 line.

It comes with one extra safety feature in the form of the Click & Safe Snug Harness Indicator.


Britax Advocate G4 Britax Advocate G4

The Britax Advocate G4 is the top of the Britax G4 line.

It is the only seat in the Britax G4 series that come with SICT a.k.a. Side Impact Cushion Technology.







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