britax marathon car seat dimensions Britax Poplar S Convertible Car Seat Sand Onyx

britax marathon car seat dimensions Britax Poplar S Convertible Car Seat Sand OnyxThe Britax Poplar S Convertible Car Seat is the best space saving convertible car seat for parents seeking advanced crash protection, ClickTight fast installation, and 3 across seating capability in a compact 17 inch profile. This convertible combines advanced safety innovation, superior comfort, and space saving design to make every ride safer and simpler. Built with ClickTight installation technology and ReboundReduce stability bar, this seat

The Britax Poplar® S Convertible Car Seat is the best space-saving convertible car seat for parents seeking advanced crash protection, ClickTight® fast installation, and 3-across seating capability in a compact 17-inch profile. This convertible combines advanced safety innovation, superior comfort, and space-saving design to make every ride safer and simpler. Built with ClickTight® installation technology and ReboundReduce™ stability bar, this seat ensures a secure fit with minimal movement, giving parents confidence with every drive. Designed for long-term use, the Poplar® S transitions seamlessly from rear-facing (up to 50 lbs) to forward-facing (up to 65 lbs) without complicated conversion steps. Compare the Britax Poplar S to the Graco Extend2Fit: both offer extended rear-facing and forward-facing capability with adjustable headrests, but the Poplar S features ClickTight installation (3-step, pinch-thread-click system vs. traditional LATCH), ReboundReduce™ stability bar, SafeCell® crumple technology, patented V-shaped tether with staged-release stitches, naturally flame-retardant SafeWash® fabrics, 14-position no-rethread harness, 6 recline positions, carbon steel frame, 17-inch slim profile for 3-across seating, and 50+ years of Britax heritage. Choose Poplar S if you want premium crash protection, fastest installation, and compact 3-across capability; choose Graco Extend2Fit if you prioritize budget-friendly pricing. Inside, your child enjoys premium comfort with refined inserts, plush padding, and 6 recline positions for a custom fit at every stage of growth.

Inside, your child enjoys premium comfort with refined inserts, plush padding, and 6 recline positions for a custom fit. SafeWash® fabrics, naturally flame-retardant and machine washable, make cleanups effortless while maintaining Britax's commitment to quality and safety. The ClickTight® installation system simplifies setup with just three steps—open, thread and buckle the seat belt, then click it closed—for confident installations every time without confusion or error. The ReboundReduce™ stability bar helps minimize movement in the event of a crash when rear-facing, providing additional protection during the most critical early years. SafeCell® Technology acts as a crumple zone to absorb crash energy and divert it away from your child. The patented V-shaped tether with staged-release stitches helps slow and reduce forward movement during impact. The 5-point safety harness distributes crash forces evenly across your child's body for maximum protection. The carbon steel frame reinforces seat structure for strength and stability across thousands of miles. The 14-position headrest and harness adjust easily as your child grows without rethreading, eliminating annual maintenance hassles. Three premium comfort inserts, including one specifically designed for infants up to 22 lbs, provide plush, tailored support from birth through toddlerhood. The SpaceSaver™ slim 17-inch profile fits 3-across in most vehicles while maintaining interior comfort—a critical consideration for multi-child families. Six recline positions offer optimal comfort and vehicle fit for both rear- and forward-facing modes. Automatically-tensioning harness ensures the restraint is always secure and snug. Clearly labeled belt paths make installation straightforward and error-free for any caregiver. Dual removable, dishwasher-safe cup holders keep drinks within reach while simplifying cleanup. The naturally flame-retardant SafeWash® fabric is durable and safe to machine wash and dry for quick cleanup after spills and accidents.

Britax Poplar® S Convertible Car Seat Features:

• ReboundReduce™ stability bar: Helps minimize movement in the event of a crash when rear-facing, providing added protection during critical early years

• ClickTight® installation system: Simple three-step system—open, thread and buckle, click it closed—for confident installs every time without LATCH confusion

• SafeCell® technology: Acts as a crumple zone to absorb crash energy and divert it away from your child

• Patented V-shaped tether: Staged-release stitches help slow and reduce forward movement during impact

• 5-point safety harness: Distributes crash forces evenly for maximum protection across torso and shoulders

• Carbon steel frame: Reinforces seat structure for strength and stability across extended use

• Naturally flame-retardant fabrics: SafeWash® materials are free from added FR chemicals for safer comfort

• SpaceSaver™ slim 17-inch profile: Fits 3-across in most vehicles while maintaining interior comfort for all passengers

• Refined comfort inserts: Three premium inserts, including one for infants up to 22 lbs, provide plush, tailored support

• 14-position headrest and harness: Easily adjusts as your child grows without rethreading—annual adjustments simplified

• Six recline positions: Offers optimal comfort and vehicle fit for both rear-facing and forward-facing modes

• Automatic tensioner: Ensures the harness is always secure and snug throughout wear

• Clearly labeled belt paths: Make installation straightforward and error-free for any caregiver

• Dual removable cup holders: Dishwasher-safe for easy cleaning and convenient drink storage

• SafeWash® fabric: Durable, naturally flame-retardant, chemical-free material that's safe to machine wash and dry

• Convertible rear-to-forward transition: Smoothly transitions from rear-facing (up to 50 lbs) to forward-facing (up to 65 lbs) without complicated steps

• Compact, space-saving design: Ideal for smaller vehicles, multi-seat setups, and families needing 3-across capability

Safety and Protection Features:

• ClickTight® three-step installation: Industry's fastest installation system reduces setup errors and ensures secure fit every time

• ReboundReduce™ stability bar: Minimizes crash movement during rear-facing collisions

• SafeCell® crumple technology: Absorbs and redirects crash energy away from your child

• V-shaped tether with staged-release stitches: Reduces forward movement during impact crashes

• Carbon steel reinforced frame: Maintains structural integrity during collisions

• Energy-absorbing shell: Multiple layers protect head, neck, and torso

• 5-point harness system: Distributes forces evenly across safety zones

• Automatic tension harness: Stays secure without manual tightening

Comfort and Convenience:

• Six recline positions: Custom fit for sleeping newborns to alert toddlers

• 14-position no-rethread headrest: Grows with child from birth through age 5+ without annual rethreading

• Three premium comfort inserts: Newborn insert supports infants up to 22 lbs with proper spinal alignment

• SafeWash® naturally flame-retardant fabric: Machine-washable comfort without added chemicals

• SpaceSaver™ 17-inch slim profile: Maximizes cabin space while providing full-size interior comfort

• Dishwasher-safe cup holders: Easy cleanup keeps seat fresh

Why Choose Britax Poplar S?

The Poplar S delivers exceptional value for parents seeking a space-efficient convertible with premium crash protection and installation ease. The ClickTight® system is the fastest installation available—no threading LATCH straps, no confusion about proper tension, just three intuitive steps. The 17-inch slim profile is unmatched in the convertible category, enabling true 3-across seating in vehicles where traditional convertible seats won't fit side-by-side. Combined with 50+ years of Britax safety heritage, advanced protection technologies like ReboundReduce™ and SafeCell®, and naturally flame-retardant SafeWash® fabrics, the Poplar S makes premium safety accessible and practical for modern families.

See Entire Britax Collection