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Britax Pioneer Harness-to-Booster Seat

Quick Overview

Looking for a convertible car seat but you don't need it to rear-face anymore, and you'd love if it could turn into a booster so you don't have to keep buying seats every few years?

In that case, the Britax Pioneer combination forward-facing convertible car seat  + booster seats is a perfect fit.

It has among the highest weight capacities in Canada and Britax's world-renowned safety features.


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Also consider: Looking for a seat like this that also has the option to easily install with a lap belt (e.g. if you want to install it in the middle of the back seat)? Check out the Britax Frontier CT. Compared to the Pioneer, it also has HUGS chest pads (with energy-absorbing SAFE CELL technology) and the EZ Buckle feature (the buckle doesn't get stuck under their bum all the time).


The PIONEER™ incorporates BRITAX’s leading safety innovations, including their patented Head-Safety technologies such as: Base with SafeCell Technology, Integrated Steel Bars, and Energy Absorbing Versa-Tether. These components work together to protect your child’s head by minimizing forward movement during a frontal impact.

The PIONEER also protects your child during side impact crashes thanks to its True Side Impaction Protection. This level of side impact protection incorporates deep side walls and a head restraint lined with EPS foam to shield and divert crash forces away from your child while keeping the head, neck and body aligned or “in true.”

The Tangle-Free, Five-Point Harness contains your child and distributes crash forces across the strongest parts of the body.

Comfort and convenience features include: an open, easy-access belt path; a quick-adjust, no-rethread harness; front-adjust recline; integrated cup holders and storage; multiple buckle positions; fixed armrests; easy transition from harness to booster mode, comfort foam; and an easy-remove cover.

The Pioneer provides a roomy fit with leading safety technologies to keep your growing child both safe and comfortable.

Premium Safety Features

  • True Side Impact Protection provides deep side walls and a head restraint with energy-absorbing EPS foam to distribute crash forces, shield from vehicle intrusion, and contain the head, neck and body while keeping them “in true” or aligned
  • Base with SafeCell Technology designed to keep your child safe and secure in a crash by compressing and significantly lowering the center of gravity, reducing the forward movement of the car seat
  • Integrated Steel Bars strengthen the connection to the vehicle and reduce forward flexing of the child seat during a crash
  • Energy Absorbing Versa-Tether anchors the top of the car seat to the vehicle using a two-point attachment, minimizing the amount of forward movement of the car seat. Stage-released stitching helps reduce the crash forces reaching the child
  • Tangle-Free, Five-Point Harness (with 7 harness height positions - up to 18.5”) contains your child and distributes crash forces across the strongest parts of the body
  • Compatible with SecureGuard which works with the vehicle safety belt in booster mode to prevent the child from sliding under the lap-belt portion of the safety belt during impact, thus minimizing the risk of abdominal injury (accessory sold separately)


Superior Fit and Comfort Features:

  • 65-pound Weight Capacity in Harness Mode allows your child to remain harnessed up to 65 lbs
  • 110-pound Weight Capacity in Booster Mode for safety and comfort as your child grows
  • Front-Adjust Recline for optimal child comfort
  • Two Buckle Positions offer a snug and secure fit for your growing child
  • Armrests provide a natural and comfortable place to rest arms

Superior Ease-of-Use Features

  • Easy-Access Belt Paths simplify installation when using the vehicle seat belt
  • Quick-Adjust No-Rethread Harness easily adjusts the harness shoulder height and head restraint from the front of the seat without disassembling the harness straps
  • Integrated Cup Holders and Storage are designed for easy access to children’s cups, snacks and toys
  • Easy Transition from Harness to Booster Mode without removing harness straps
  • Easy-Remove Cover allows easy cleaning, without disassembling the harness or uninstalling the car seat
  • Color-Coded Vehicle Belt Guides provide clear indication of the path and positioning of the vehicle seat belt for use in either harness or booster mode
  • Premium LUAS Connectors included
Child Weight (lbs) Forward Facing Harness: 2 years & 25, up to 65 (2 years & 11.3, up to 29.4 kgs)
Booster: 40 - 110 (18.1 - 49.9 kgs)
Child Standing Height (in) Forward Facing Harness: 30 - 56 (76.2 - 142.2 cm)
Booster: 45 - 60 (114.3 - 152.4 cm)
Child Seated Shoulder Height (in) Forward Facing Harness: 12.5 - 19.5 (31.8 - 49.5 cm)
Booster: 15 - 22 (38.1 - 55.9 cm)
Product Weight (lbs) 21 (9.5 kgs)
Product Dimensions Harness Minimum (in) 19W x 28H x 21D (48.3W x 71.1H x 53.3D cm)
Product Dimensions Harness Maximum (in) 19W x 35H x 21D (48.3W x 88.9H x 53.3D cm)
Product Dimensions Booster Minimum (in) 19W x 28H x 21D (48.3W x 71.1H x 53.3D cm)
Product Dimensions Booster Maximum (in) 19W x 35H x 21D (48.3W x 88.9H x 53.3D cm)
Seating Compartment Height (in) 21.5 (54.6 cm)
Seat Area Depth / Width (in) 13.5 / 12 (34.3 / 30.5 cm)
Shoulder Width (in) 15.5 (39.4 cm)
Harness Slot Heights (in) 12.5 / 13.5 / 14.5 / 15.5 / 16.5 / 17.5 / 18.5 / 19.5
31.8 / 34.3 / 36.8 / 39.4 / 41.9 / 44.5 / 47 / 49.5 cm)
Buckle Strap Depths (in) 7.0 / 9.0 (17.8 / 22.9 cm)

Customer Reviews

Love the Pioneer! Review by Kimberley
We love this big boy seat! It's easy for my son to get himself in and out of, with lots of cup holder storage for all those nature goodies he picks up along the way. I'm excited that it will become a high back booster and we won't have to get another car seat. Plus, the colour options are beautiful! (Posted on 2015-09-18)

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