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Britax Pioneer G1.1 Harness-2-Booster Oasis
This item is a final sale item. Returns cannot be accepted.

The Britax Marathon Infant/Child Car Seat is an excellent choice for getting your family where they need to go safely and comfortably.  SafeCell Impact Protection surrounds your child in safety and Complete Side Impact Protection shields your child in a protective shell designed to absorb crash forces and protect from debris. A 10-Position, Quick-Adjust Harness makes it easy to ensure the proper fit as your child grows.

Product Highlights:
  • Base with SafeCell Technology features SafeCells designed to compress in a crash, significantly lowering the center of gravity and counteracting the forward rotation of the child seat which normally propels the child toward the front 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 features a staged-release tether webbing to slow the forward movement, reducing the crash forces reaching the child, and a two-point attachment to minimize forward rotation while anchoring the top of the child seat
Product Features:
  • Anti-rebound bar to limit child seat rotation in a crash when installed rear facing.
  • Easy-Remove Cover allows easy cleaning without disassembling the harness or uninstalling the car seat
  • Side Impact Protection comprised of deep side walls lined with energy-absorbing EPP foam distributes crash forces, shields from vehicle intrusion, and contains the head, neck and body
  • Tangle-Free, Five-Point Harness distributes crash forces across the strongest parts of the body and provides a secure fit
  • Harness Ultra Guard System (HUGS) provides resistance to forward movement in the event of a crash
  • 65 lb (29.4 kg) Weight Capacity for safety and comfort as your child grows
  • Rear and Forward Facing Recline for child comfort and positioning
  • High Density Comfort Foam provides an extra layer of padding to gently cushion your child
  • Two Buckle Positions for your growing child
  • Quick-Adjust Harness repositions the harness shoulder height without disassembling the harness straps
  • Premium LUAS Connectors for a quick and simple installation featuring a push button for easy release
  • Built-in Lock-Offs ensure a snug lap and shoulder belt installation with minimal effort
  • Anti-Slip, Contoured Base grips and protects the vehicle seat while offering optimum vehicle fit
  • EZ-Buckle System keeps buckles and straps out of your way when placing your child in the car seat.
  • Infant Positioning Pillow offers extra comfort while achieving proper harness fit for small infants


We're sorry! This item is exempt from samples.


Unfortunately, due to the nature of this item, we cannot accept any returns, click here for more information.
This product is excluded from any special promotions or coupons.
We are only able to ship this item to Canadian customers.
We can only ship this product to the 10 Canadian provinces.
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Debbie: a few months ago

Our daughter is quite tall, and we found her previous convertible car seat made it impossible for her to climb into our car on her own. It also meant her feet were constantly pushing on the back of the front seat. This seat fixes all of those problems, and the buckles are much easier to use! We love it!


Beck: a few months ago

Love it.. however the front of the base does move around when you pull strap to tighten (even when secured very tightly with luas clips). This happens with our diono too,so not sure if it's just how these 3 in 1's work. If you leave straps fixed, it's not an issue. Great seat though and Love the easy height adjustment. Love Britax quality!

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