SKU: 4369692428
britax car seat 0-4

britax car seat 0-4 Britax One4Life Slim All-in-One Car Seat

Sale price$20.43 Regular price$22.70
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Description

britax car seat 0-4 Britax One4Life Slim All-in-One Car SeatThe One4Life Slim all in one car seat takes your child from birth to big kid with trusted Britax safety, ClickTight installation, and a slim SpaceSaver design. As a convertible and harness 2 booster seat in one, it grows with your child for 10 years. It starts rear facing with an extended capacity of up to 50 lbs., so your child can ride rear facing longer. It easily converts to forward facing toddler mode (up to 65 lbs.) and high back belt

The One4Life® Slim all-in-one car seat takes your child from birth to big kid with trusted Britax safety, ClickTight® installation, and a slim SpaceSaver™ design. As a convertible and harness-2-booster seat in one, it grows with your child for 10 years. It starts rear-facing with an extended capacity of up to 50 lbs., so your child can ride rear-facing longer. It easily converts to forward-facing toddler mode (up to 65 lbs.) and high-back belt-positioning booster mode (up to 120 lbs.) when your child is ready. With a slim outside and spacious inside, the 17.5” seat is designed to fit 3 across* without compromising safety and comfort. ClickTight helps you install with confidence, every time. The base and shell are easy to wipe down for hassle-free cleanup. The car seat cover is safe to machine wash and dry, and it’s naturally flame-retardant with no added FR chemicals. One4Life Slim features a high-strength steel frame, a SafeCell® crumple zone, and a V-shaped tether. As your child grows, you can easily adjust the 15-position no-rethread harness and headrest with one hand. With cooling channels, premium padding, three infant inserts, and built-in armrests, your child will love every ride. 

  • All-in-One Car Seat: One4Life® Slim is a convertible and harness-2-booster seat in one!
  • It easily converts from a rear-facing infant and toddler seat (5-50 lbs.) to a forward-facing seat (30-65 lbs.) to a high-back booster seat (40-120 lbs.)
  • 10 Years of Use: This slim all-in-one car seat grows with your child from 5 to 120 lbs. and up to 63” tall
  • ClickTight® Installation: Install with confidence in 3 easy steps: pinch to open, thread and buckle, click it closed!
  • SpaceSaver™ Design: Slim outside, spacious inside! The 17.5” seat is designed to fit 3 across without compromising on trusted Britax safety and premium comfort.
  • Premium Fabrics: The woven mélange accents give the car seat cover a tailored look, while the soft knit fabric on the padding and inserts helps keep your child comfortable during every ride
  • Woven Accents on the Exterior and Comfort Pads: Made from recycled polyester
  • Hassle-Free Cleanup: Extra space between the shell and base means you can clean under the seat with ease – and with minimal grooves in the seating area and base, you can wipe it down with no fuss
  • SafeWash® Fabrics: No more hand-washing or waiting for the cover to air-dry; just quick and easy cleanup so you can keep moving
  • Naturally Flame-Retardant Cover: With no added FR chemicals
  • Three Removable Infant Inserts: Help provide a better fit for infants 20 lbs. and under
  • Accessible Color-Coded Belt Paths: Make it easy to route the seat belt through the correct path for each car seat mode
  • Slide-Out Cup Holders: The dishwasher-safe cup holders slide out with ease for convenient cleaning and click back into place for a secure attachment during rides
    \Cup-Holder-Free Option: Remove the cup holders completely and insert the armrest caps to save additional space
  • 15-Position No-Rethread Harness and Headrest: Adjust together quickly and easily with one hand to help create the proper fit as your child grows; no rethreading, ever!
  • Patented V-Shaped Tether with Staged-Release Stitches: Helps slow and reduce forward movement during a crash
  • High-Strength Steel Frame: Reinforces the seat structure to help keep it sturdy and stabilized
  • Quick-Push, 9-Position Recline with Easy-Read Indicators: Helps you find the most comfortable fit for your child and the correct angle for your vehicle
  • SafeCell® Technology: Acts as a crumple zone, absorbing crash energy to help keep it away from your child
  • Two Layers of Energy Management: The protective seat shell and foam-lined headrest help absorb impact energy and are designed to help keep your child's head, neck, and body safe
  • Soft Comfort Pads: Help prevent the harness from rubbing against your child’s skin
  • Flip-Forward Buckle Pad: Stays out of the way for easy boarding; made with extra padding for premium comfort
  • Built-In Cooling Channels: Improve airflow to help keep your child comfortable
  • Plush Padding: For superior comfort and a quiet ride
  • Easy-Pull Harness Adjuster: Lets you tighten the harness using just one hand
  • Harness Holder Slots: Keep the harness straps out of the way while your child gets in and out of the seat
  • 5-Point Safety Harness with Diamond Weave Webbing: Provides adjustment points at the hips, shoulders, and between the legs
  • Tag-Free Headrest: Supports your child’s head and neck without irritation

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

Specifications

  • Dimensions: 24.5"H x 18.5"D x 17.5"W
  • 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: 4369692428

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4.2 ★★★★★
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Verified Purchase
Shay C.
Lake Worth, US
★★★★★ 5
Mode switch pigtail a little large for firewall pass through
Harness works great, quick and easy to install, only issue I had was the mode switch pigtail was a little large to push into firewall pass through and it could use an additional 2’ to 3’ of wire on mode switch end
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 2, 2022
R
Verified Purchase
roys_fishing
West Palm Beach, US
★★★★★ 1
Poor quality switches
Main power switch didn’t work and since I didn’t get a chance to install when I ordered it, I can’t return it! Once again Amazon gets my money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 28, 2025
J
Verified Purchase
Jeff krevsAmazon Customer
West Palm Beach, US
★★★★★ 5
Highly recommended
This is the BEST harness for side shooters lights . I just wish the switch would light up but Awsome harness
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 8, 2023
S
Verified Purchase
SpartanGrad
Draper, US
★★★★★ 5
Can't ask for more from a 7.1 or 5.1.2 receiver
Style: Receiver, Style: Receiver
My previous Yamaha receiver was 10 ys old, and was an entry level 5.1 model (RX-V373). I accidentally fried it by putting my phone's USB connector in. I have been wanting to upgrade for a while the last few yrs but waited it out until receivers have 8k pass through (so whenever 8k becomes more of a thing I can keep this new one a bit longer). The 3773 had 4k pass through when I got it 10 yrs ago, well before 4k became as available as it is now for example, which was one reason I held out on replacing as long as I did. This time around I decided to step up into the premium Aventage line of Yamaha. It was between this & the A4A, not a huge price difference, but I would have needed to replace my entertainment center since the A4A is too deep to fit. Didn't seem worth it & now I'm really happy with my choice. My living room set up (in a condo) has 2 surrounds, to add 2 more would require building mounts on the wall (couch is against the wall with 2 surrounds on side tables) which I don't want. This has 7 channels to allow for 2 Atmos front firing speakers which I got & love how immersive it sounds. Bi-amping the front towers is an option, but that uses 2 extra channels so the Atmos front speakers can't be connected at the same time as bi-amping. I experimented with biamping & biwiring & couldn't hear any difference so I have the fronts biwired, allowing for the 2 Atmos front connections. New features/improvements from my old receiver include more power/watts, lower THD & better sound, streaming music directly from the receiver with Music Cast, and it processes Atmos & DTS audio. One key feature all the Aventage models have that the RX ones don't is the 5th foot in the middle, which was designed & tested to improve the sound with more stabilization. Aventage also has a 3 yr warranty (vs 2 for RX). The top of the line RX model looks identical in specs which I also considered but it just sounds like this 1st Aventage model is slightly better with it its parts & sound quality, and not that much more. Especially since I got the A2A on sale for 999.95 (vs the 1200 price). I actually bought this for 1150 which was a teeny mark down, and then saw Amazon put it on sale for 999.95 shortly after (about 2 weeks). Amazon customer service was great when I called about that, and they credited the difference. Back to the receiver...2 subwoofers can be connected, and an amplifier for the 2 front speakers can be connected as well through pre outs. Probably more improvements but those are the main ones. Along with this receiver upgrade, I also upgraded my subwoofer & added a Nvidia Shield Pro streamer (due to it handling Atmos & 4k upscaling of lower hd content, which my Roku Ultra cannot do). My system now includes Polk TSI 400 front towers Polk CS20 center, Polk T15 surrounds (all of these Polk speakers are from 10 yrs ago as well & still work great for me, they sound better too with this receiver). I added Klipsch R-41SA Atmos front firing speakers, and upgraded from a Polk PSW505 subwoofer to an SVS SB3000 (night & day difference with that upgrade!). Have a Roku Ultra from a few yrs ago, and the Nvidia as well now. The TV also will be upgraded at some point, but I'm perfectly content with it now (is a 7 yrs old 55 inch 4K Sony Bravia). This receiver also processes Dolby Vision which I'd need a new TV for, as well as eArc which this receiver also has. Over time I will continue adding to my set up. A decent record player is next, and a current blu ray player (the one I have is rather old & only has 1080p). Then a new TV & A 2nd sub (will get another SVS SB3000). The last & most expensive upgrade will be the rest of the speakers. From Polk to B&W most likely, but when I get to this I will compare both at the same price point as I am still very impressed with the quality of my Polks for their price point. I also plan to add an amp (Emotiva most likely) to power the fronts. Another reason I was ok with the A2A watts per channel for now (100 with 2 channels driven for music, unsure what it is at 5.1.2 but it's plenty especially with the thunder the SVS sub provides even at low volumes, and the ability to boost dialogue in addition to the center channel. I'd rather get a dedicated amp for more music power than a higher priced receiver just due to more watts. Very pricey to do all of this at once (in particular the speakers & amp), but for now I am thrilled with how much better everything sounds with these phase 1 upgrades. Highly recommend it, if you are coming from an entry level budget receiver this can pump more life into your current speakers.
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Reviewed in the United States on February 17, 2023
A
Verified Purchase
Amazon Customer
Alexandria, US
★★★★★ 5
Sounds fantastic and easy to operate
Style: Receiver
I used to sell home audio equipment a long time ago and I love this unit! Nice & clean look, the layout for inputs/output is standard and easy to see and the remote makes sense...well, to me it does lol. I had purchased an O***o unit because it's been good brand for a while...returned it because it was defective but I didn't care for it (you had to be a real audiophile to get into the setup and who has time for that?). The Yamaha is easy to work with and sounds fantastic. Make sure you don't go cheap on the speakers!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2026

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