Search  for anything...
Britax

Britax One4Life All in One Convertible Car Seat, 3 in 1 Car Seat & Booster Seat with Easy ClickTight Installation, Extended Rear Facing Capacity, and Breathable SafeWash Fabrics —Raven Black

  • Based on 0 reviews
Condition: New
Checking for the best price...
$439.99 Why this price?

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 90-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Apr 28
Order within 9 hours and 51 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Color: Raven Black


Style: One4Life


Features

  • ALL-IN-ONE CAR SEAT: Designed to grow with your child for 10 years, this 3 in 1 car seat easily converts from a rear facing infant and toddler car seat (5-50 lbs) to a forward facing car seat with a harness (30-65 lbs) and, finally, to a high back booster seat (40-120 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: Install with confidence in 3 easy steps: Pinch to open, thread and buckle, click it closed!
  • EXTENDED REAR-FACING CAPACITY: Accommodates children up to 50 lbs and 49 rear-facing, so your child can ride rear-facing longer
  • TRUSTED BRITAX SAFETY: This all in one car seat is equipped with a steel frame, SafeCell technology, two layers of energy management, and our patented V-shaped tether. The seat is side-impact tested according to FMVSS 213a.* It is also tested to FMVSS 213 frontal impact standards. *FMVSS 213a sets side-impact standards for children up to 40 lbs and 43 with a 5-point harness. It does NOT include standards for testing harnessed children above 40 lbs and 43 or for booster mode.
  • SAFEWASH FABRICS: No more hand-washing or waiting for the cover to air-dry; just quick and easy cleanup so you can keep moving; the car seat cover is also naturally flame-retardant with no added FR chemicals
  • 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 best angle for your vehicle
  • PREMIUM COMFORT: Breathable knit fabrics allow airflow to help keep your precious cargo cool and comfortable*, while the silky-smooth cover and plush padding make for enjoyable rides (*Select fashions only)
  • THREE INFANT INSERTS: Help provide a better fit for infants 20 lbs and under
  • TIMELESS, SOPHISTICATED AESTHETIC: Warm, neutral fashions create a sleek, polished, and versatile look to match your lifestyle
  • 2 DISHWASHER-SAFE CUP HOLDERS: Help keep your little one's drinks or snacks within reach; easily twist out for cleaning between rides

Description

It all starts with the first ride home. Then, there’s the first family outing. The first ride to daycare. Soon, you’ll be driving them to their first play date or soccer game. Throughout every change and milestone, you can count on one constant for your journey: the Britax® One4Life® all in one convertible car seat. This 3 in 1 car seat and booster seat combo takes your child from birth to big kid with trusted Britax safety, ClickTight® technology for easy installation, and parent-approved convenience features. One4Life starts as a rear facing car seat with an extended capacity of up to 50 lbs, allowing your child to ride rear facing longer. It easily converts to a forward facing car seat (30-65 lbs) and a belt-positioning booster seat (40-120 lbs) when your child is ready. Thanks to ClickTight technology, you can install with confidence, every time. As your child grows, you can easily adjust the 15-position harness with just one hand — no rethreading required. This all in one car seat features a high-strength steel frame, SafeCell® technology, and a V-shaped tether, helping to give you peace of mind for the road ahead. The washer and dryer-friendly car seat cover is available in warm, neutral tones with a sophisticated aesthetic to match your lifestyle. Plus, it’s naturally flame-retardant with no added FR chemicals. The breathable knit fabrics allow airflow to help keep your precious cargo cool and comfortable, while the plush padding helps make rides enjoyable. With thoughtful convenience features, premium comfort, and an all in one design, you can confidently navigate every stage of the journey with just one car seat — for life. 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. Select fashions only.

Maximum Weight Recommendation: 120 Pounds


Minimum Height Recommendation: 18 Inches


Minimum Weight Recommendation: 5 Pounds


Maximum Height Recommended: 63 Inches


Rear Facing Maximum Weight: 50 Pounds


Forward Facing Maximum Weight: 120 Pounds


Rear Facing Minimum Weight: 5 Pounds


Forward Facing Minimum Weight: 30 Pounds


Forward Facing Car Seat Minimum Height: 35 Inches


Rear Facing Car Seat Maximum Height: 49 Inches


Installation Type: Seat Belt


Orientation: Rear and Forward Facing


Harness Type: 5-Point


Number of Height Positions: 15


Brand: Britax


Age Range Description: Kid


Infant Toddler Car Seat Type: Convertible Car Seat


UPC: 652182749910


Manufacturer: Britax USA


Unit Count: 1.0 Count


Manufacturer Warranty Description: 1 Year Limited Warranty


Item Dimensions D x W x H: 20.5"D x 19.5"W x 25"H


Item Weight: 30 Pounds


Material Type: Steel, Plastic, & Polyester


Color: Raven Black


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Apr 28

Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Buy one!
Color: Raven Black Style: One4Life Slim
100% a britax customer for life. Super easy to install, functional, great value considering it will last a long time, very durable, easy to clean, excellent fit on my son. It is on the heavier side so i wouldn’t recommend if you move cars a lot but even so, it’s still worth it!
Reviewed in the United States on March 10, 2026 by Amanda
    • recommend
Color: Raven Black Style: One4Life Slim
Thai car seat is great, i love the padding, place of cup holders as they are toward the do t and do t take room away from the beady seat. The buckle is great quality, it’s very easy for me to buckle and unbuckle.
Reviewed in the United States on December 14, 2025 by Lena
    • 5 STAR for SAFETY
Color: Raven Black Style: One4Life
Was in a head on collision going over 50mph. Daughter is 2 and was rear facing. She walked away with zero issues. This is a phenomenal car seat. Wish my wife and I could have been in one.
Reviewed in the United States on February 15, 2026 by Bobby B.
    • No suave, no buen soporte para bebès
Color: Raven Black Style: One4Life Slim
Review Image by Elda M. Elda M.
Compré esta silla para mi bebé de 6 meses de 15 libras, no lo recomiendo para bebés de esta edad o tamaño, su cabeza cuelga cuando se duerme lo que nunca me pasó con su anterior carseat de otra marca, los straps padding son lo peor no son nada suaves, raspan su cuello y cara, incómodos para un bebé, lo voy a regresar, sin embargo tenemos un igual para nuestra hija mayor de 3 años y funciona bien, no recomiendo para bebés, más bien para toddlers si. ... show more
Reviewed in the United States on October 4, 2025 by Elda M. Elda M.
    • Fabric tears easily
Color: Raven Black Style: One4Life
Love the safety features but <6 months of use and the fabric on the buckle padding has already torn.
Reviewed in the United States on March 9, 2026 by Chloe
    • *** MADE IN CHINA ***
Color: Raven Black Style: One4Life Slim
****MADE IN CHINA**** I thought that Britax was made in the USA (South Carolina) that's where they were previously made when my oldest was in a car seat and they were top of the line then. Well they seem to have sold out and although online you will see that this model is made in the USA it is sadly not, clearly stamped made in China, but a Maxi-Cosi Pria Chill it is made in Indiana and has fans to keep your child cool built into the back that activate when the child gets warm, oh and its $100 cheaper than these sell outs are selling this China made car seat for. When I noticed the made in China I immediately returned it. Britax really disappointed me with this move and it is unfortunate that they have moved most of their production to China. Americans need to start recognizing these companies that sell out and refuse to buy their products and opt for made in the USA products on t only do you get a better quality product in majority of cases but you support your fellow American workforce and maybe if these companies can't sell there foreign made products they will stop shipping all their production overseas. Hope this helps anyone looking for a made in the USA carseat. ... show more
Reviewed in the United States on October 26, 2025 by Jose Montana
    • Got this instead of another nuna exec
Color: Raven Black Style: One4Life Slim
Review Image by Lex Lex
I actually had the all in one (non-slim) version and it was good. Bit it was too big for both my Tundra and Tesla model X. I couldn't fit my kids side by side. This one is nice because it actually fits well but I would be cautious putting a little baby (my son is 1) in it. It has holes on the side they could get stuck in if someone isn't there next to them. My baby is 25lbs so I don't have to work about this. ... show more
Reviewed in the United States on December 9, 2025 by Lex Lex
    • Not really worth the money
Color: Raven Black Style: One4Life Slim
I got this due to the fact everyone told me how safe it was and all the safety features it has. However, my daughter has gotten her arm stuck in the little hole that is in the back side a number of time (I’m not even sure what it’s for) but this last time she really got it stuck and I was driving in the freeway while she was screaming “arm stuck!” I had to pull over and unbuckle her and take her out all the way amd work her arm out. The other issue that I’ve had is that the lock seat has popped up a few times when the lock was on making the car seat not locked in and moving around. Needless to say, not worth $400. I thought it was going to be something safe for my daughter to go up in, but we’ve had issues and not that she has had her arm stuck a number of times, it’s not worth it. ... show more
Reviewed in the United States on February 2, 2026 by Stephanie

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...