SKU: 31146519715
britax marathon convert to booster

britax marathon convert to booster Britax Poplar S Convertible Car Seat

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Description

britax marathon convert to booster Britax Poplar S Convertible Car SeatThe 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.

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Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 31146519715

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Mikaela Colvin
San Leandro, US
★★★★★ 5
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Versatile boots for business wear. The calf profile is sleek and slim so they are wearable under straight cut pants but also look beautiful paired with a midi skirt and sweater. I am 5’6” and 145 lbs. These stop right below my kneecap and have just enough room in the calf to slide up my leg but stay in place. I am usually a size 8 and originally purchased an 8 in these boots but found the toe too short and narrow. When I sized up to an 8.5 the toe bed was comfortable and roomy. Heel is just high enough to give a dressed up look but is still comfortable to walk in.
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Reviewed in the United States on February 7, 2026
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BayAreaStyle
Grantham, US
★★★★★ 5
Slyvia boot is a great looking pair of boots
Size: 8, Color: Black Leather
These are a great pair of boots that run true to size. Genuine leather as they do conform to fit. Hell height is perfect on these boots and are wearable 6 to 8 hours easily with no pain. I make sure to condition the leather on my boots before wearing and after every 2nd to 3rd wearing stuff the bootsto store them.
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Reviewed in the United States on January 7, 2026
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Jan Holland, Esq.
Lexington, US
★★★★★ 5
Buttery soft, comfortable and the perfect height!!!
Size: 10.5, Color: Black Leather, Size: 10.5, Color: Black Leather
I ripped these out of the box as soon as they arrived lol 😂 I knew they were the black knee high boots that I wanted to have as a staple in my Fall closet. They did not disappoint! The stitching is impeccable, they are buttery soft from top to bottom, they are the signature San Edelman design, the heel is perfect – it’s not clunky it’s sleek, but it’s not too high so you can wear these with pants and dresses and skirts. They are VERY COMFORTABLE!!! They are pointy - but I sized up a half so they are not squeezing my foot at all. I can move my toes around and there’s enough space for socks if I need to wear them. I am in ❤️!!!
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Reviewed in the United States on September 5, 2025
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Anniebgud
New York, US
★★★★★ 4
These boots were made for walking…
Size: 9, Color: Chocolate Brown
Stylish black suede boots with an adorable chunky heel. The fit is true to size. They look elegant yet dangerous! They were also, surprisingly, very comfortable!
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Reviewed in the United States on March 28, 2026
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Emily Summer
Dallas, US
★★★★★ 5
My favorite boots ever!
I searched forever to find the perfect camel boots and could not be happier with this purchase. So happy, in fact, that I bought another pair in a different color! They’re really soft and the perfect heel height to still be comfortable. They are so classy and definitely a staple for me for work. Love!
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