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Grow With You

Grow With You

Product Code: E1C449H
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Harnessed Booster by Britax

Grow With You™ harness-2-booster grows with your child from toddler to big kid. It’s made with premium fabrics and padding for superior comfort and style. 2 layers of side impact protection surrounds the head, neck & torso. Plus, SafeCell Technology in the base creates a crumple zone that absorbs crash energy. Installing the seat is simple using the premium, quick-push LATCH connectors. And, with arm rests, cup holders, and harness comfort pads, even big kids enjoy the ride.


  • FROM TODDLER TO BIG KID - Easily transition from Harness to Booster - By tucking buckles and straps safely within the seat.
  • SHIELD YOUR CHILD - 2 Layers of Side Impact Protection - Energy-absorbing shell and foam-lined headrest protect your child’s head, neck, and torso.
  • ABSORB CRASH ENERGY - Patented SafeCell Technology - Creates a crumples zone in the car seat base that helps absorb crash energy.
  • STABILIZE THE SEAT - Industrial-Strength Steel Frame - Reinforces the seat structure to help keep it stabilized.
  • REDUCE FORWARD MOVEMENT - Patented V-Shaped Tether - Staged-release stitches help slow and reduce forward movement during a crash.
  • ADJUST WITH ONE HAND - 9-Position, Quick-Adjust Harness & Headrest - Move together to create the proper fit as your child grows.
  • RELAX & RECLINE - 2 Recline Positions - Help you find a comfortable fit for your child and the best fit for your vehicle.
  • KEEP SNACKS WITHIN REACH - 4 cup and snack holders - Keep drinks, snacks, and toys within your child’s reach.
  • Forward-facing Harnessed Weight: 11.3-30.0 kg
  • Forward-facing Harnessed Height: 85.0-125 cm
  • Belt Positioning Booster Weight: 18.0 -54.0 kg
  • Belt Positioning Booster Height: 112.0-160.0 cm
Product Dimensions
Weight10.4 kg
Depth53.3 cm
Width48.3 cm
Height63.5 cm (90cm with headrest fully extended)
Child's Age, Height & Weight
Age RangeMust be at least age 2 years and up to 12 years approx
Height RangeForward Facing Harness: 85.0-125 cm, As Booster: 112.0-160.0 cm.
Weight RangeForward Facing Harness:11.3 kg - 29.4 kg, Booster: 18 - 54.4 kg
Installation Method
IsofixYes (Latch)
Seat Belt System3-point seat belt or lap belt
Top TetherBritax recommends that the top tether be used at all times when installing the child seat. Using the top tether will improve the stability of your child seat and reduce the risk of injury
Rearward FacingNo
Forward FacingYes
Safety Standard
New Zealand Standard 'S' markYes
Safety Features
Side-Impact ProtectionYes, 2 layers.
Energy-Absorbent FoamYes
Extended Features
Expiry Date9 years from date of purchase
Manufacture Warranty1 year
Harness5 point safety harness

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