Britax Pioneer 70 Combination Harness-2-Booster Car Seat
By: Britax

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The PIONEER 70 offers premium safety, comfort and convenience for your growing child that is ready to graduate from their convertible car seat.

  • 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
  • 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
  • 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
  • 70-pound Weight Capacity in Harness Mode allows your child to remain harnessed up to 70 lbs
  • 110-pound Weight Capacity in Booster Mode for safety and comfort as your child grows
  • Easy-Access Belt Paths simplify installation when using the vehicle seat belt
  • 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
  • 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)
  • Front-Adjust Recline for optimal child comfort
  • Comfort Foam provides an extra layer of padding to cushion your child
  • 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 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
  • Armrests provide a natural and comfortable place to rest arms
  • Two Buckle Positions offer a snug and secure fit for your growing child
  • Premium Lower LATCH Connectors included
  • Harness-2-Booster converts to a belt-positioning booster seat
  • Made in the USA with global components


Child Weight (lbs) Forward Facing Harness: 2 years & 25, up to 70
Booster: 40 - 110
Child Standing Height (in) Forward Facing Harness: 30 - 54
Booster: 45 - 59
Child Seated Shoulder Height (in) Forward Facing Harness: 12.5 - 18.5
Booster: 15 - 21
Product Weight (lbs) 21
Product Dimensions Harness Minimum (in) 19W x 28H x 21D
Product Dimensions Harness Maximum (in) 19W x 34H x 21D
Product Dimensions Booster Minimum (in) 19W x 28H x 21D
Product Dimensions Booster Maximum (in) 19W x 34H x 21D
Seating Compartment Height (in) 21.5
Seat Area Depth / Width (in) 13.5 / 12
Shoulder Width (in) 15.5
Harness Slot Heights (in) 12.5 / 13.5 / 14.5 / 15.5 / 16.5 / 17.5 / 18.5
Buckle Strap Depths (in) 7.0 / 9.0


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