Britax Grow with You Harness to Booster

$319.99 $369.99
By Britax

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

Grows with your child from toddler to big kid

  • Trusted Quality, Upgraded Design: Looking for Britax Pioneer? Grow With You is Britax's newest harness-to-booster car seat
  • 2-in-1 Booster Seat: Easily transitions from forward-facing harness mode to belt-positioning booster mode as your child grows from toddler to big kid
  • Easy Installation: Quick-push LATCH connectors and color-coded belt guides
  • Britax Safety: High strength steel frame, crumple zone and patented v-shaped tether
  • Full Body Protection: 2 layers of side impact protection surround the head, neck & torso
  • No Rethreading, Ever: 9-position, quick-adjust 5-point harness & headrest move together using one hand for the proper fit
  • Premium Fabrics: Nap-friendly padding and fabrics for superior comfort & style
  • More Comfort: Stay-put, soft comfort pads keep your child’s neck from rubbing against the harness strap

Seat specifications

Child Fit Information

  • Forward-facing Harnessed Weight 25 - 65 lbs (11.3- 30 kg)
  • Forward-facing Harnessed Height 34 - 49" (86.36 - 124.46 cm)
  • Belt Positioning Booster Weight 40 - 120 lbs (18 - 54 kg)
  • Belt Positioning Booster Height 44 - 63" ( 111.76 - 160.02 cm)

Exterior Product Dimensions

  • Product Weight 23 lbs (10.43 kg)
  • Product Dimensions (L x W x H)21" (L) x 19" (W) x 25" (H) (53.34 cm X 48.26 cm X 63.5 cm)
  • Headrest Fully Extended Height 35.5" (90.17 cm)

Interior Product Dimensions

  • Seating Area Depth 15" (38.1 cm)
  • Seating Area Width 12" (30.48 cm)
  • Shoulder Width 12" (30.48 cm)
  • Harness Slot Heights 9 positions, 12" - 20" (30.48 cm - 50.8 cm)
  • Buckle Strap Positions 2 positions, 7.0" - 9.0" (17.78 cm - 22.86 cm)


Britax strongly recommends that children should be secured with a harness system until they exceed the weight or height limits specified.

Click Here to learn how to install your Britax Grow With You Harness-2-Booster using Latch