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Britax Grow With You Harness Booster Car Seat - Dusk [New Version of the Pioneer]

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Grow With Youô harness-2-booster grows with your child from toddler to big kid. Itís 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.
  • Harness mode 25lbs - 65 lbs; Booster mode 40 lbs -120 lbs.
  • Stylish, soft-knit fabrics look great in your backseat.
  • SafeCell Technology acts as a crumple zone, helping to absorb crash energy.
  • Industrial strength steel frame reinforces the seat structure to help keep it stabilized.
  • V-shaped tether with staged-release stitches helps slow and reduce forward movement during a crash.
  • 2 Layers of Side Impact Protection: Energy-absorbing shell and foam-lined headrest protect your childís head, neck, and torso.
  • Premium, quick-push LATCH connectors for simple, secure installation.
  • 9-position, quick-adjust harness & headrest move together using one hand for the proper fit as your child grows.
  • 2-position buckle can be moved outward to accommodate your growing child.
  • 2 recline positions help you find the most comfortable fit for your child and the best fit for your vehicle.
  • 4 cup and snack holders keep drinks, snacks, and toys within reach.
  • Harness comfort pads keep your childís neck from rubbing against the harness strap.
  • Nap-friendly padding & fabrics for superior comfort and a quiet ride.
  • Color-coded belt guides make it easy for you and your child to route the seat belt through the right paths.
  • Easy-to-remove cover for cleaning without uninstalling the car seat or removing the harness.
  • Flip-forward buckle stays out of the way for easy boarding.
  • Easy-to-clean arm rests help your child ride comfortably.
  • Proudly designed, tested and built in the USA with US and global components for safety and quality.


  • Forward-facing Harnessed Weight: 25 - 65 lbs
  • Forward-facing Harnessed Height: 34 - 49"
  • Belt Positioning Booster Weight: 40 - 120 lbs
  • Belt Positioning Booster Height: 44 - 63"
Exterior Product Dimensions:
  • Product Weight: 23 lbs
  • Product Dimensions: 21" (L) x 19" (W) x 25" (H)
  • Headrest Fully Extended Height: 35.5"

Review Summary
8 Reviews
75% (6)
13% (1)
0% (0)
0% (0)
13% (1)
88% Recommend this product (7 of 8 responses)
By Tidy D.
New York, NY
Great Features!
April 20, 2021
I love this car seat! My 4-year-old daughter is able to ride comfortably, and it will grow with her into a booster seat. It is so easy to install, and also easy to adjust as she grows.
* This product review was collected by the manufacturer.
By Monique A.
River Ridge, LA
Love this seat immediately!
March 22, 2021
Just received my Harness-to-Booster seat, and it was VERY easy for me (grandma) to figure out and install. It came in a cool carseat-shaped box (genius), packaging was excellent. My cat likes it for a playhouse now. Surprised my 5 yo grandson with it today, and he absolutely loves it, said it's really comfortable. I'm looking forward to a few good years of use of this well-constructed product.
* This product review was collected by the manufacturer.
By Ash K.
February 25, 2021
I have been purchasing britax car seats for 6 years now, they were my go to brand. I recently upgraded my twins to the grow with me boosters. I haven't even installed them in the car yet and I noticed a piece was broken. The process to adjust the crotch buckle is poorly planned out. You have to unclip very flimsy, very cheap plastic clips that are holding the fabric on the seat. One of those clips snapped when removing, using the exact instructions in the manual. Why would you choose to use such a cheap design in an excellent rated, and one of the more expensive car seat options out there??
* This product review was collected by the manufacturer.
By Khara
Tustin, CA
Great seat!
November 27, 2020
My 5 year old peanut loves this seat. Itís easy to set up and click in. The only annoying thing is the styrofoam behind the head rubs and makes an awful noise.
Not sure how to fix that.
Otherwise, it does its job and we feel safe with my child in it.
By Kathryn
Apex, NC
Great Harness Booster
November 27, 2020
Bought this for my 4 year old so I could move the baby to his convertible car seat. He adores this seat. Itís comfortable, he thinks heís big stuff with two cup holders and space for a snack or toy. I love the security of the five point harness. Heís on the average, or maybe even slightly small side, so having a five point harness that he can use for a few years is very important to me. Itís easy to install and easy to move from one vehicle to another, if needed.
By Karen B.
September 30, 2020
My daughter in law read the safety ratings and that is why we chose this seat for our grandson. It seems well made and has a good crash rating. Not a 5 point harness but easy to install and comfortable head rest adjustments
By g
Oldest loves it.
September 10, 2020
I love the cup holders and so does my oldest toddler. Like all of Britax products, it is easy to install. I should say no complicated instructions. No complaints from our household about it!
By Travis
Comfortable, convenient, easy install
July 23, 2020
We love this for our 4 year old. Sheís able to grab books and toys from a box beside her seat. Install was a breeze with the latch harnesses.
  • Size, install

1 Question & 0 Answers
Emoke Kotroczo
from Texas asked:
January 8, 2020
Is it Aircraft Travel Certified when in Harness Mode?

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