SKU: 57472212158
britax 3 across

britax 3 across Britax Poplar S Convertible Car Seat Sand Onyx

$19.07 $21.19
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Ships within 48 hours · Estimated delivery Nov 11 - Nov 16

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Description

britax 3 across Britax Poplar S Convertible Car Seat Sand OnyxReady to go with room to grow! The Poplar S convertible car seat takes the stress out of moving to the next car seat stage thanks to the patented ClickTight installation and slim SpaceSaver design. This convertible car seat accommodates up to 50 lbs when installed rear facing, allowing your child to ride rear facing longer. It easily switches to a forward facing car seat as your child grows, accommodating up to 65 lbs. ClickTight technology provides

Ready to go with room to grow!

The Poplar® S convertible car seat takes the stress out of moving to the next car seat stage thanks to the patented ClickTight® installation and slim SpaceSaver™ design. This convertible car seat accommodates up to 50 lbs when installed rear-facing, allowing your child to ride rear-facing longer. It easily switches to a forward-facing car seat as your child grows, accommodating up to 65 lbs.

ClickTight technology provides fully open seat belt paths that are clearly labeled and easy to access, and the automatic tensioner takes care of the tightening. This baby car seat lets you easily adjust the 14-position no-rethread harness and headrest to help create the perfect fit. 

The premium inserts also help provide refined comfort and a tailored fit. The ReboundReduce™ stability bar easily attaches to the car seat when installed rear-facing, helping to minimize movement in the event of a crash. Slim outside and spacious inside, this convertible car seat features 17-inch SpaceSaver™ technology designed to fit 3-across* without compromising on trusted Britax® safety and premium comfort.

The rear-facing car seat includes a patented SafeCell® crumple zone and a V-shaped top tether to help manage crash energy. Carbon steel frame and belt paths provide strength and stability. The car seat cover fabrics are naturally flame-retardant with no added FR chemicals, and they’re safe to machine wash and dry time and again.

*Britax cannot guarantee 3-across installation fitment in all vehicles

  • Convertible Design: Works as a rear-facing car seat with the infant insert and converts to a forward-facing car seat as your child grows 
  • Fit: Rear-facing 5-50 lbs; Forward-facing 30-65 lbs. *Due to regulatory changes, weight and height ranges may vary by model. Always follow the weight and height specifications listed in your product's user guide and on your product labels. 
  • ClickTight® Installation: With ClickTight, you know it’s right in just 3 easy steps: open, thread and buckle, click it closed 
  • ReboundReduce™ Stability Bar: Carbon steel bar easily attaches to the car seat when installed rear-facing to minimize the movement in the event of a crash; must be removed when installed forward-facing 
  • SpaceSaver™ Design: Slim 17" seat is designed to fit 3-across without compromising on trusted Britax® safety and premium comfort. *Britax cannot guarantee 3-across installation fitment in all vehicles 
  • Infant Insert: Specifically helps to properly position newborns
  • 5-Point Safety Harness: Helps evenly distribute crash energy to keep your child safe 
  • Patented V-Shaped Top Tether: Has 2 connection points to help slow and reduce forward movement in a crash; easily stores away when not in use 
  • Easy-Read Level Indicators: The 6-position and quick-adjust recline helps you find the most comfortable fit for your child and the best fit for your vehicle 
  • Naturally Flame-Retardant Fabrics: With no added FR chemicals 
  • SafeCell® Technology: Acts as a crumple zone, helping to keep crash energy away from your child 
  • Easy-Adjust Harness: The 14-position no-rethread harness and headrest move to help create the perfect fit 
  • Carbon Steel Frame: Reinforces the seat structure to help keep it sturdy and stabilized 
  • Flip-Forward Buckle Pad: Stays out of the way for easy boarding 
  • Washer and Dryer-Friendly: No more hand-washing or waiting for the cover to air-dry; just quick and easy cleanup, so you can keep moving 
  • Dishwasher-Safe Cup Holders: The 2 cup holders slide in and out for easy cleaning between rides 

Usage

  • Newborn to 50 lbs.

Specifications 

  • Dimensions: 23.5"H x 20.5"D x 17"W
  • Product weight: 28 lbs.
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: 57472212158

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4.9 ★★★★★
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M
M
San Leandro, US
★★★★★ 5
Quality mats that provide noticeable noise suppression
Size: 10 sqft
I used these mats when I replaced the carpet in my Chevy Tahoe. Cutting the mats to size was easy enough with a utility knife and a straightedge. The adhesive backing stuck fairly well, but I used a roller to press the mats into place on the metal panels, which seemed to help them adhere a little better. Under the old carpet was the type of insulation you'd typically see under carpet in a typical home. It was worn, so I tossed it and installed the new carpet directly over these new mats. The before & after difference in noise was minimal, but noticable. But I only installed them on the floor - not in the doors, rear hatch area, firewall, or roof. So overalll, I'm pleased with these mats as they provided the noise suppression that I had expected.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 20, 2026
U
Us
Los Angeles, US
★★★★★ 5
Easy to cut and easy to install
Size: 10 sqft, Size: 10 sqft
You receive 9 sheets of RUNSUNSPRII Car Sound Deadening Mat that each measure 9.75" x 15.75". This calculates to a total of 9.6 square feet in total for all of the sheets. Of all the different styles of sound deadening mats, foil lined butyl is the best type for eliminating vibration. This quality product has a printed gridwork of 2-inch squares on the liner to aid in cutting the correct sized pieces. Even with as sticky as this product is, it is super easy to cut to shape with one pass of a razor blade. OEM auto manufacturers use this same kind of product extensively on the inner structure for sound deadening and to block sound and air transmission through all sizes of holes and cutouts. Because it is highly waterproof, it also is perfect for blocking areas to prevent water intrusion. The very sticky pads adhere to all surfaces and are very flexible and will conform to fit many areas. Because it is thin, it is ideal to install under interior trim panels without causing interference with how the panels fit.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 26, 2026
E
EverydayConsumerEddy
Natrona Heights, US
★★★★★ 5
Solid quality and good price
Size: 10 sqft
I bought this for my custom built camper van and it’s been great so far. For $24, the amount of coverage you get is totally fair, and I’ll probably grab a second box to finish everything. It’s easy to install with just scissors and something to press it down, and making quick cardboard templates really helps for tight spots. The adhesive is insanely strong, so once it sticks, it’s not going anywhere (just don’t let it stick to itself). Keep in mind this is sound deadening, not full soundproofing, but even with partial coverage I can already hear a difference in reduced road noise and vibrations. I’m using this as a base layer and plan to add soundproofing on top, and so far I’m really happy with how it’s turning out.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 22, 2026
D
Verified Purchase
Dorthy Shortz
Fort Morgan, US
★★★★★ 5
It's a job but totally worth it
Size: 36 sqft
Pack a lunch when you tackle this project boys.. its a doozy!! Month in going great so far definetly did what I purchased it to do. 2000 chevy with two p3 10s every bass drop sounded like an old firebird with loose trunk bolts. Threw this on the back walls floor underneath the speaker and the doors.. all that energy is now in the cab with me instead of getting lost in rattling metal!! Love it!!! Left a few pieces outside after I was done rained like hell on them so water doesnt hurt this stuff at all or direct sunlight in south mississippi.. good stuff pick this up and make them systems thud instead of rattle!!! You wont regret it!! I didn't!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 11, 2026
R
Verified Purchase
Roseanna Boyce
Carnegie, US
★★★★★ 5
Delivers a quieter ride
Size: 36 sqft
This works very well to put down road noise. The difference was immediate in my van. I was shocked it made such a difference.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026

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