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Frequently Asked Questions
Ensuring that the Britax Poplar and Poplar S car seats are correctly installed is crucial for your child's safety. The black positioning runners on the bottom of the car seat's base must rest entirely flat on your vehicle's seat, however the space beyond the runners’ outside edges is permitted to overhang the vehicle seat edge. You are also permitted to have up to 3 inches (7.5 cm) of the base extending beyond the front edge of your vehicle's seat in either rear-facing or forward-facing modes, as illustrated in the user guide (see illustration on page 12). If the shape of your vehicle's seat prevents the base from making adequate contact, adjusting the car seat to a more upright recline angle may be necessary to help ensure proper installation.
Remember: It is essential that the black base positioning runners on the bottom of the car seat's base not only sit flat on the vehicle's seat but also remain parallel to it. This configuration is crucial to help ensure the car seat performs as intended in the event of a collision.
Both Poplar & Poplar S Convertible Car Seats combine the patented ClickTight® Installation system with a 17" slim SpaceSaver™ design, helping to an ensure easy and secure fit in your vehicle. They both offer extended rear-facing fit up to 50 pounds and transition smoothly to forward-facing as your child grows. The ClickTight Technology simplifies installation with wider easy-to follow belt paths and an automatic tensioner. Both seats are designed for 3-across installation* and feature a reinforced frame, SafeCell® crumple zone, and V-shaped top tether for enhanced crash energy management. *Britax cannot guarantee 3-across installation fitment in all vehicles
- Poplar: The Poplar Convertible Car Seat is machine washable & dryable cover (naturally flame-retardant fabrics), two removable dishwasher-safe cupholders, and lower infant insert (required for certain weight ranges).
- Poplar S: The Poplar S Convertible Car Seat offers these additional features: a removeable head pad (optional), upper body support pillow, and ReboundReduce™ Stability Bar.
At 17 inches wide, the Poplar & Poplar S Convertible Car Seats are designed to fit 3-across* without compromising on trusted Britax safety & premium comfort.
*Britax cannot guarantee 3-across installation fitment in all vehicles.
You MUST use the lower infant insert for children weighing 22 lbs. (10 kg) or less in a rear-facing position. Do not use it for children over 22 lbs. (10 kg) or in a forward-facing position.
The length from front to back of the Britax Poplar Convertible Car Seat when reclined on a flat surface, like the floor, is 28.5”. Please note this will vary depending on different variables in a vehicle, like the angle of the vehicle seat, and compression of the seatback (and contour thereof). This measurement will be very situationally specific.
Both car seats offer one-handed, quick-adjust headrest and harness system for the perfect fit as your child grows, eliminating the need for rethreading.
The ReboundReduce® Stability Bar was designed to be exclusively used in rear-facing mode with Britax Poplar and Poplar S Convertible Car Seats. This bar helps minimize motion in the event of a crash.
- (US): The ReboundReduce™ Stability Bar is optional in the US but included in the box with the Poplar S as well as sold separately as an accessory.
Follow these simple steps to adjust the Britax Poplar & Poplar S Convertible Car Seats head restraint and harness positions:
1. Lift harness release button and pull both harness straps forward.
2. Squeeze the harness height adjuster (on head rest), slide the harness into the desired position and release.
3. Ensure head rest is locked into position before using.
Yes, the Poplar and Poplar S Convertible Car Seat can be reclined in accordance with instructions and warnings.
If the car seat base doesn't make proper contact due to the vehicle seat's design, you should adjust the recline angle of the car seat to a more upright position. This will help ensure that the base rests securely on the vehicle seat, which is essential for the proper performance of the car seat. It's equally important to remember that the car seat angle must be appropriate for your child's age, size, and the direction the car seat is facing. For rear-facing seats, a more reclined position is often necessary to support your child's head and neck, while forward-facing seats may require a more upright angle.
If you're unable to achieve this contact, you should try a different, yet approved, seating position. If you are still unable to position the seat as instructed, feel free to contact customer service.
Yes, a maximum of 3 inches (7.5 cm) of the base can overhang the front edge of the vehicle seat for rear or forward-facing installations.
The Poplar & Poplar S Convertible Car Seats feature a versatile design with 14 shoulder harness height options, ranging from 8 to 17 inches. It's important to note that when using the insert, the lowest harness position is designed to accommodate even small children comfortably. This helps ensure that the seat can be adjusted to fit a wide range of child sizes, providing a safe and snug fit right from infancy.