Britax Marathon G4 Convertible Car Seat, Onyx

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  • Tangle-free, 5-point harness distributes crash forces across the strongest parts of the body and provides a secure fit
  • 2 buckle positions for your growing child
  • Built-in Lock-Offs ensure a snug lap and shoulder belt installation with minimal effort
  • The Onyx Britax Marathon Convertible Car Seat energy absorbing Versa-Tether features a staged-release tether webbing to slow the forward movement, reducing the crash forces reaching the child
  • Anti-Slip, contoured base grips and protects the vehicle seat while offering optimum vehicle fit
  • Quick-adjust harness repositions the harness shoulder height without disassembling the harness straps on the child convertible car seat
  • Integrated steel bars strengthen the connection to the vehicle and reduce forward flexing of the child seat during a crash
  • 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
  • Forward-facing for children 20 to 65 lbs; standing height: 49" or less, seated shoulder height: 12"-16.75"
  • Child convertible car seat case 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
  • Assembled weight: 19.5 lbs
  • 2-point attachment to minimize forward rotation while anchoring the top of the child seat
  • The Britax Marathon G4 Convertible Car Seat is rear-facing for children 5 to 40 lbs; standing height: 49" or less, seated shoulder height: 9"-16.75"
  • The Onyx Britax Marathon Convertible Car Seat has premium lower LATCH Connectors for a quick and simple installation featuring a push button for easy release
  • Infant positioning pillow offers extra comfort while achieving proper harness fit for small infants
  • High-density comfort foam provides an extra layer of padding to gently cushion your child
  • EZ-buckle system and harness holders keep harness straps out of the way when placing your child in the car seat
  • Rear- and forward-facing recline for child comfort and positioning
  • Harness Ultra Guard System (HUGS) provides resistance to forward movement in the event of a crash
Rear-Facing Forward-Facing Harnessed Booster Seat High Back Booster Backless Booster Crash Tested Side Impact Tested LATCH-equipped 5 Point Harness EPS Impact Absorbing Foam Steel Reinforced Frame Belt Guides Simply Safe Adjust Harness System Safecell Impact Protection Safety Synergy Technology Recline Adjustable Headrest Adjustable Harness Height Cup Holder Storage Compartments Removable Cushions Removable Cover Rubberized Base Lightweight Stay In Car Base Foldable
About Britax

For many years, Britax has been a leader in baby car seats, both in Europe and the U.S. Parents appreciate the quality that goes into their rear- and forward-facing car seats that accommodate babies up to 70 pounds. The Britax baby carrier has won awards for its design, as it distributes the child’s weight across back, hips, and shoulders. Our baby products and travels systems come in a number of attractive colors and designs.

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