Britax Poplar S Narrow Convertible Car Seat - Sand Onyx

The Britax Poplar S Convertible Car Seat is a premium convertible car seat designed to make installation easier while maximizing space in your vehicle. Featuring patented ClickTight® Installation, a slim 17-inch SpaceSaver™ design, extended rear-facing capability up to 50 lbs, and the exclusive ReboundReduce™ Stability Bar, the Poplar S delivers trusted Britax safety, premium comfort, and everyday convenience from infancy through the forward-facing years.

Whether you're transitioning from an infant car seat, fitting three car seats across, or looking for a convertible car seat that's simple to install correctly, the Britax Poplar S is built to grow with your child while providing outstanding protection and comfort at every stage.

Why Parents Choose the Britax Poplar S

• Patented ClickTight® Installation makes installation simple in three easy steps: Open, Thread & Buckle, Click Closed.
• Exclusive ReboundReduce™ Stability Bar helps reduce rear-facing movement during certain types of crashes.
• Extended rear-facing accommodates children from 5–50 lbs and up to 49 inches tall.
• Forward-facing harness mode supports children from 22–65 lbs.
• Slim 17-inch SpaceSaver™ design helps fit three car seats across in many vehicles.*
• SafeCell® technology helps absorb crash energy before it reaches your child.
• Carbon steel frame provides exceptional strength and stability.
• 14-position no-rethread harness and headrest adjust together as your child grows.
• Six-position recline with easy-read level indicators helps achieve a proper fit in your vehicle.
• Includes an infant insert for children up to 22 lbs, plus two premium comfort inserts for a more customized fit and added comfort.
• SafeWash® fabrics are naturally flame-retardant with no added FR chemicals.
• Machine washable, dryer-friendly cover and two removable dishwasher-safe cup holders for quick, easy cleanup.

Who Is the Britax Poplar S Best For?

The Britax Poplar S is an excellent choice for parents looking for a premium convertible car seat that's easy to install, comfortable for everyday use, and designed to keep children rear-facing longer. It's especially well suited for growing families, smaller vehicles, and caregivers who want the convenience of a slim car seat without sacrificing safety or comfort.

What's Included

• Britax Poplar S Convertible Car Seat
• ReboundReduce™ Stability Bar
• Infant Insert
• Two premium comfort inserts
• Two removable dishwasher-safe cup holders
• User guide

Key Specifications

• Child Weight: 5–65 lbs
• Rear-Facing: 5–50 lbs, up to 49"
• Forward-Facing: 22–65 lbs, up to 49"
• Product Dimensions: 20.5" L × 17" W × 23.5" H
• Seat Width: 17"
• Headrest Positions: 14
• Recline Positions: 6
• Service Life: 10 years from the date of manufacture

Frequently Asked Questions

What is the difference between the Britax Poplar and Poplar S?
The Poplar S includes the ReboundReduce™ Stability Bar for additional rear-facing crash protection, along with two premium comfort inserts for an improved fit. Both models feature ClickTight® Installation, SafeCell® technology, and the slim 17-inch SpaceSaver™ design.

Is the Britax Poplar S easy to install?
Yes. ClickTight® Installation allows you to open the seat, route and buckle the vehicle seat belt, then click the seat closed for a simple and secure installation.

Can the Britax Poplar S fit three car seats across?
The slim 17-inch SpaceSaver™ design is engineered to help fit three car seats across in many vehicles. Because vehicle interiors vary, Britax cannot guarantee three-across compatibility in every vehicle.

Are the Britax Poplar S fabrics machine washable?
Yes. The Poplar S features SafeWash® fabrics that are naturally flame-retardant with no added FR chemicals. The removable cover is machine washable and dryer friendly, making cleanup after everyday messes quick and convenient. Always follow the care instructions on the product label.

How long is the Britax Poplar S good for?
The Britax Poplar S has a 10-year service life from its date of manufacture. The date of manufacture (DOM) and expiration date are printed on the car seat's serial label.

*Three-across fitment depends on your specific vehicle. Britax cannot guarantee three-across installation in every vehicle.