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BRITAX

Britax One4Life Slim All-in-One Car Seat, 10 Years of Use, 17.5” SpaceSaver Design, Converts from Rear-Facing Infant Car Seat to Forward-Facing Booster Seat, ClickTight Installation, Raven Black

  • Based on 1,056 reviews
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Availability: Only 3 left in stock, order soon!
Fulfilled by CapitalKidz
Arrives Thursday, Jul 3
Order within 3 hours and 54 minutes
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Color: Raven Black


Style: One4Life Slim


Features

  • All-in-One Car Seat: One4Life(R) 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.)
  • ClickTight(R) Installation: Install with confidence in 3 easy steps: pinch to open, thread and buckle, click it closed!
  • SpaceSaver(TM) Design: Slim outside, spacious inside! The 17.5 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
  • Premium Car Seat Cover: Features a soft knit fabric with woven melange accents that are made from recycled polyester; the cover is safe to machine-wash and dry and naturally flame retardant with no added FR chemicals
  • Trusted Britax Safety: Features a patented V-shaped tether, SafeCell(R) technology, a high-strength steel frame, and two layers of energy management
  • Comfortable Rides: This slim car seat includes soft comfort pads, built-in mesh cooling channels, three infant inserts, plush padding, and a tag-free headrest
  • Easy to Adjust: The 15-position no-rethread harness and headrest adjust together easily with one hand, and the 9-position recline has an easy-read indicator to help you find the correct angle for your vehicle
  • 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
  • Accessible Color-Coded Belt Paths: Make it easy to route the seat belt through the correct path for each car seat mode
  • 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

Description

The One4Life(R) Slim all-in-one car seat takes your child from birth to big kid with trusted Britax safety, ClickTight(R) installation, and a slim SpaceSaver(TM) 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(R) 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. Britax cannot guarantee 3-across fitment in all vehicles.

Brand: Britax


Installation Type: Seat Belt


Material: Alloy Steel, Plastic


Color: Raven Black


Orientation: Rear and Forward Facing


Product Dimensions: ‎18.5 x 17.5 x 24.5 inches


Item model number: ‎E1D437A


Minimum weight recommendation: ‎5 Pounds


Maximum weight recommendation: ‎120 Pounds


Minimum height recommendation: ‎18 Inches


Maximum height recommendation: ‎49 Inches


Material Type: ‎Alloy Steel, Plastic


Material Composition: ‎Plastic and Steel


Care instructions: ‎Machine wash and dry cover


Style: ‎One4Life Slim


Number of reclining positions: ‎15


Batteries required: ‎No


Orientation: ‎Rear and Forward Facing


Rear-facing maximum child weight: ‎50 Pounds


Forward-facing minimum child weight: ‎30 Pounds


Forward-facing maximum child weight: ‎120 Pounds


Harness type: ‎5-Point


Item Weight: ‎28 pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jul 3

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Very happy with this car seat!!
Color: Glacier Graphite Style: One4Life
Review Image by Kay. Kay.
My little one outgrew his infant car seat and I looked for months trying to find one to suit our needs. Most importantly I was looking for additional safety features! Pros: For my Honda odyssey it fits better than my other seats (graco and Evenflo). Installation- this always gives me anxiety because it usually takes me forever to install and I never get it snug enough. The Evenflo 360 is a nightmare to install for me. This was AMAZING. I was literally telling so many moms about the installation and how fast, easy and SECURE it was. Seat cushion for younger babies has very obvious instructions on weight so you don’t have to look back in the manual. The level indicator is available to see on both sides which is a big win for 2 car seats. Comfort- baby was struggling to nap in his old seat and spent hours crying. I moved him into this one and though he still has taken some time to settle in he’s actually napped for me in the seat. I truly believe he’s more comfortable. Cons: it’s very heavy! (Honestly not really a con for me, but I know for some it can be). I haven’t been able to adjust my daughter’s seat to a more comfortable recline position for her comfort without keeping it within the level indicator. I need to look into this further since she’s complaining that she feels she’s sitting too far forward. I have 2 of these seats rear facing for my 10 month old who is 20 pounds and daughter 4 years and 30 pounds. Looking forward to long rear facing and safety with these seats ... show more
Reviewed in the United States on April 21, 2025 by Kay. Kay.
    • Great Car Seat!!!
Color: Iris Onyx Style: One4Life
I looked heavily into purchasing a car seat before deciding what car seat is the best for my baby. My biggest concerns were: 1. Safety 2. Longevity (Weight/height capacities) 3. Price With those 3 things in mind I ultimately decided on the Britax One4Life. It is rated one of the safest car seats in US and European standards. It has different modes that will grow with your child up to booster seat mode which supports up to 120 pounds. Lastly the price tag is a little hefty, but with the idea that I won't have to buy a booster seat it made sense to go with this one. My daughter has been using it for about 8 months now, and we absolutely love it! ... show more
Reviewed in the United States on May 24, 2025 by Leonor Lopez
    • Favorite car seat for my (soon to be) three kids!
Color: Onyx Stone Style: One4Life
We’ve bought five of these because it is our favorite car seat. I’ve also recommended it to at least three friends. They are so easy to install and the kids are comfortable in them. I really like that the rear facing weight limit is so high because I plan to keep my kids rear facing as long as I can. My one complaint is that the cup holders pop off easily, but in the grand scheme that isn’t that big of an issue. Will continue to buy these as we have more kids! ... show more
Reviewed in the United States on May 31, 2025 by Mimie Hull
    • Love
Color: Iris Onyx Style: One4Life
Love britax because the install is amazing. Very comfortable and roomy for both my babies. Will always be my go- to car seat.
Reviewed in the United States on June 23, 2025 by Tiffany Cauthorne
    • Highly recommend
Color: Jade Onyx Style: One4Life
Review Image by artzone artzone
I just purchased this car seat. First off How it looks: beautiful love the style comes in many colors and styles i did the one 4 life click tight ( it is actually true it installs tightly). Supper soft and easy to follow instructions. What features: well I purchase this for easy installation and it also looked very comfortable too when it arrived it had many cushions and air netting on the sides for to breath. Side button with one push and easy to adjust tilit It was easy to find the buttons all labeled side and under the seat. Pros: easy to read and understand, easy to adjust and installation was a breeze. Once installed correctly it dosent move at all very impressive as I have had many car seats and they always move a little even once installed correctly this one was zero movement highly recommend for safty. Con well I don't really have any yet it is so far everything I hoped for. So weight: well it is on the more heavier side but it's not any heavier than Carring a baby carrier with base. It is solid to carry and solid once buckled. Other qualities it also is approved for other transport such as a plan if you wish to fly. What I love is the tilt feature and how it grows with your child, easy to install and read direction on the car seat visible and it is in two languages. The cushions for the head is very comfortable. Highly recommend for baby on up however I already pass the baby stage carrier and purchase this after my child was already one. It can even use for infants up to 10 years old Again highly recommend ... show more
Reviewed in the United States on February 21, 2025 by artzone artzone
    • Britax is always the way to go!
Color: Jade Onyx Style: One4Life
LOVE our Britax products! This color combo (teal and black) is holding up to the stains better than our purple one we purchased previously.
Reviewed in the United States on June 20, 2025 by Sabrina
    • Great product!
Color: Cool Flow Carbon Style: One4Life
Great grow with me car seat! Easy to adjust as they grow, cup holders remove easy for cleaning as dot he cushions. Easy install and to move form car to car if needed. Rear and front facing for when they get bigger, Britax has been good to us as a family!
Reviewed in the United States on May 29, 2025 by Kelsey H
    • Very sturdy but hard to use click right difficult to click into place
Color: Eclipse Black Style: One4Life
I have two of this exact car seat. Both have issue with shoulder straps being even. Both car seat shoulder straps one is tighter than the other when in place on the child. Cup holders remove can be washed easily. The click tight feature to snap in place with the seatbelt are hard to snap in place if you have seat belt tight enough in my opinion. But overall very sturdy, take lbs a high amount of weight for child car seat. Has every seat option you would need as child grows. Easy push button to adjust the should height. Heavy car seat. ... show more
Reviewed in the United States on January 12, 2025 by Kristen

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