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Britax One4Life Slim All-in-One Convertible Car Seat with ClickTight
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$479.99
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At a glance
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About this item
Highlights
- 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 mélange 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(R) Safety: This slim car seat features a patented V-shaped tether, SafeCell(R) technology, a high-strength steel frame, and two layers of energy management
- 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
- 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. It starts rear-facing with an extended capacity of up to 50 lbs. 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.* 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. *Britax cannot guarantee 3-across fitment in all vehicles.
Dimensions (Overall): 24.5 Inches (H) x 17.5 Inches (W) x 18.5 Inches (D)
Weight: 28 Pounds
Suggested Age: Newborn and Up
Features: Forward or Rear Facing Seat, No-Rethread Harness, multi-position recline, Fits 3 Car Seats Across, LATCH Compatible, Machine Washable Seat Pad
Fits Child (Forward Facing): Height between 44 Inches and 63 Inches, Weight between 40 Pounds and 120 Pounds
Fits Child (Rear Facing): Height between 18 Inches and 49 Inches, Weight between 5 Pounds and 50 Pounds
Industry or Government Certifications: Meets FMVSS 213
Material: Plastic
Battery: No Battery Used
Care & Cleaning: Machine Dryable Cover, Machine Washable Cover
Warranty: 1 Year Limited Warranty. To obtain a copy of the manufacturer's or supplier's warranty for this item prior to purchasing the item, please call Target Guest Services at 1-800-591-3869
TCIN: 94586806
UPC: 652182750787
Item Number (DPCI): 030-09-8974
Origin: Imported
If the item details aren’t accurate or complete, we want to know about it.
Shipping details
Estimated ship dimensions: 19.1 inches length x 20.5 inches width x 27 inches height
Estimated ship weight: 33 pounds
We regret that this item cannot be shipped to PO Boxes.
This item cannot be shipped to the following locations: American Samoa (see also separate entry under AS), Guam (see also separate entry under GU), Northern Mariana Islands, Puerto Rico (see also separate entry under PR), United States Minor Outlying Islands, Virgin Islands, U.S., APO/FPO
This item ships in its manufacturer’s packaging, revealing what’s inside. ·
Return details
This item can be returned to any Target store or Target.com.
This item must be returned within 90 days of the date it was purchased in store, shipped, delivered by a Shipt shopper, or made ready for pickup.
See the return policy for complete information.
Q: What is the measurement front to back when in the most reclined position? 
submitted by Na - 6 months ago
A: Hello, The One4Life Slim is roughly 29IN fully reclined!
submitted byBritax Customer Support - 5 months agoBrand expert
Q: What are the measurements when rear facing and fully reclined?
submitted by Hi - 8 months ago
A: Hello, The One4Life Slim would be 30IN fully reclined.
submitted byBritax Customer Support - 7 months agoBrand expert
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4.3 out of 5 stars with 36 reviews
comfort: 4.82 out of 5
durable: 4.73 out of 5
ease of installation: 4.82 out of 5
quality: 4.73 out of 5
value: 4.36 out of 5
75% would recommend
12 recommendations
1 out of 5 stars
Thumbs down graphic, would not recommend
19 October, 2025Verified purchase
Not new but opened box
Delivered not as brand new but an opened box item twice. All tapes were not cut and box not sealed. Plastic cover inside was tied in a knot, not sealed. Returned for replacement and the same opened box item was delivered again.
5 out of 5 stars
Thumbs up graphic, would recommend
15 October, 2025Verified purchase
Very comfy for my toddler and sturdy too
Very comfortable for my toddler. Although it could be a little easier to read the manual.
5 out of 5 stars
Thumbs up graphic, would recommend
14 October, 2025Verified purchase
(no review title)
very heavy, not a seat you want if your switching cars a lot
5 out of 5 stars
Thumbs up graphic, would recommend
13 October, 2025Verified purchase
Worlds easiest/most secure install
As a mom of 3 (3 and under), we’ve seen our fair share of car seats. I will only own britax Clicktight car seats from now on. Since my kids are all rear facing, we have 3 of them in a row and I love them. They are so secure and when we have to rearrange our car seat arrangement when family visits so we can seat 7, it’s relatively quick and simple. Other car seats will make you cry trying to install them and even once you’re done some of them don’t feel secure at all! You will not have that problem with these.
5 out of 5 stars
Thumbs up graphic, would recommend
8 October, 2025Verified purchase
Easy to install
My favorite car seat! It doesn’t take up much space and will fit in a smaller vehicle as well! Especially if you need multiple car seats I recommend the slim!!
3 out of 5 stars
Thumbs down graphic, would not recommend
25 September, 2025Verified purchase
not a fan, clicktight is fantastic though
Install is so easy and it’s rock solid.. however, the headrest rattles like crazy. I wanted to like it, but returned it. They also added an additional “positioning layer” not seen in the photos. It’s bulky for older children.
4 out of 5 stars
Thumbs up graphic, would recommend
24 July, 2025Verified purchase
Would have loved it
I loved everything this seat had to offer however being that it’s supposed to compete with very slim seats, they missed the mark by making the base too large which caused side overhang on my vehicle seat and is not allowed per Britax manual. I purchased to use this in a center minivan seat, and while the Graco slimfit3 base fits flawlessly, the Graco has a very short harness height for forward facing and not long lasting and Britax would have resolved that issue if the base was smaller like the Graco. This Britax fit every one of my kiddos great (1 year old, 4, and 6) and my 6 year old still had a click left FF so a very long lasting seat. He had already maxed out the Graco a while ago. The seat was very comfy and plush. It did not feel cramped. It gave them good head support and the headrest fit well around their heads (Graco was terrible FF when it came to the headrests). Really disappointed about the base on this one as it would have been perfect otherwise and everything I was looking for
4 out of 5 stars
Thumbs up graphic, would recommend
17 July, 2025Verified purchase
So far so good.
I've had this seat for about three months now. There weren't a lot of real reviews when I purchased, but hoped for the best and purchased anyway since we have a Poplar for our older son and have been happy with that. Overall, I like the seat and would recommend it. Easy install and easy to adjust. The only reason I give it 4 stars is because when I have it installed in rear-facing, and the more upright you have it, the harder it is to get to the button to release the straps. This could not be the case for some vehicles though as some seats are shaped differently. Overally my 1 year old seems comfortable in it and it will fit him for a very long time.
1 out of 5 stars
Thumbs down graphic, would not recommend
18 June, 2025Verified purchase
Skip it
Love the quality, but disappointed with the fit. I’ve always trusted Britax and currently use the Poplar model for my other son with no issues. However, I was surprised and disappointed that this seat didn’t fit my tall almost-5-year-old. The straps simply wouldn’t extend far enough, no matter how much I tried. I’m not sure if it’s a design flaw with this particular model, but it was impossible to adjust the harness to fit him comfortably. Unfortunately, I’ll have to return it.
4 out of 5 stars
Thumbs up graphic, would recommend
1 June, 2025
Good seat!
Not ton of unsponsored reviews for this yet so here’s the first. It’s a good car seat. We have a Nuna Rava and Nuna Revv and after Nuna’s awful customer service when handling the recall of their Rava seat, I went looking elsewhere. I have a 9 month old and 3.5 year old. The 9 month old moved into the Nuna seats and I bought this for my 3.5 year old. Right out of the box, the color “parchment” is more gray than it is beige in my opinion. Took me by surprise honestly. Also, in comparison to the Nuna seats, it feels a little more flimsy mainly in regard to the side walls. The cushions are good and the install was a piece of cake. The seat back goes VERY high, I genuinely doubt I’ll ever need another seat before she’s able to ride without a car seat at all. The crotch buckle padding is kind of awkwardly bulky and it can make it tough to fasten your kiddo in quickly (obviously it can be removed so not a big deal). My daughter loves the cup holders compared to the Nuna ones. She says she likes her new car seat. Overall, it’s a great seat for the price point and the longevity is hard to beat. Will be purchasing another for her dad’s car!
5 out of 5 stars
Thumbs up graphic, would recommend
13 May, 2025Verified purchase
Good Car seat
The quality is very good and the color is beautiful. Very satisfied
5 out of 5 stars
Thumbs up graphic, would recommend
13 February, 2025
One4life Slim
We have used this for a few months now, and I am very impressed with how comfortable my toddler is in the seat. It was easy to install and feels secure.
3 out of 5 stars
24 December, 2024
originally posted on britax.com

The jury is out on this new model.
We need a 2nd carseat, but much to my dismay the original one for life is no longer in stock in NZ. Replaced with these slim versions. Not impressed, these look dirt cheap but are very costly and the colour choices available are dull and pretty awful. I was looking forward to getting the original in coolflow carbon as that was the best colour choice available in my country. However I am very aware now that the US get all the good colours like blue, purple, red, black with orange trim. Why is that? How come only the dud and neutral colour ranges are available in other countries? Pretty disappointing. Other carseat manufacturers distribute all their colour choices worldwide but Britax don't. Happy with the click tight system and the safety aspect but not happy with drab colours and this model in particular looking like a poor cousin of the original
4 out of 5 stars
8 November, 2024
originally posted on britax.com

Great Slim All In One Car Seat
[This review was collected as part of a promotion.] We installed the Britax One4Life Slim All-In-One car seat in our F-150 extended cab truck. We have 3 children, only one of which can ride in a booster, so basically three car seats across. My two favorite features of this Britax car seat are the slim design and the way the across anchor belt can be stored within. I’ve never had a slim car seat before, but I can see the difference it makes. I also really liked the fabric design - which isn’t necessary, but an added bonus (got the mineral gray). The car seat was relatively easy to install, but I do think it requires reading the instructions thoroughly. The cup holders are optional, but installing them doesn’t take away from the slim design. My only critique of the car seat is the harness release. I feel like it is in a low position and it seemed I had to really push it to be able to loosen the harness, but maybe over time it will be a little easier. Overall, it’s a great car seat! Thanks to the Stellar Product Testing Panel for providing me with this car seat.
5 out of 5 stars
4 November, 2024
originally posted on britax.com

Innovative Car Seat
[This review was collected as part of a promotion.] I received this car seat from the Stellar Product Testing Panel. This is overall a wonderful car seat. I was a little surprised at the heavy weight of the carseat but it's not an issue since we don't change between cars. This car seat is a high quality car seat built for security and comfort. We were a little confused about the installation of the car seat backwards with the click tight system but once we read in the manual how to access that, its a pretty great feature. The car seat shows the routing of the belt for different set ups. Once in place, seems like a secure seat. The ventilation features of the car seat are wonderful for our warm kiddo. The seat is also well designed for easy cleaning. It's a minimalist type design with comfort and secure structure. I don't love the chest buckle compared for another car seat we have but it's completely functional with no issues. This seat is also great for a slim fit to get three people in the back seat. The click tight system also is a nicer feature for three car seats because you didn't have to struggle to use the latch system worth three seats since you use the seat belt.
4 out of 5 stars
3 November, 2024
originally posted on britax.com

Absolutely beautiful carseat
[This review was collected as part of a promotion.] My first impression is that this is an absolutely beautiful carseat! We have 3 kiddos - 8, 4, and 2 so we've had our share of carseats and highback booster seats. Also both grandmas have carseats to transport our kiddos so it's safe to say, that we have done a LOT of carseat installs! Right out of the box, it's definitely heavier than other seats we have had so it's probably not the best to travel with or change between cars, but it felt extremely sturdy and I know it will keep our kiddo safe. I love that it will last from the newborn stage (even though we don't have a newborn) through the big kid stage. It's super helpful not to have to buy another carseat when they get bigger! Also, it allows you to keep your child rear facing longer if you have the space to do so in your backseat. Pros: - you only need this seat for the whole time your child needs a carseat - it's beautiful and stylish - it's slim fit in case you need to fit 3 across your backseat - adjustment was easy to fit our 2 yr old - material feels durable and you can pull the inside part out to wash Cons: - it's heavy and bulky despite it being a slim fit model - it wasn't slimmer than our previous slim fit seat, but it's definitely slimmer than a regular seat - it's pricey, but I do believe it falls in line with other models of the same brand I had to read the instructions a few times as this is my first Britax seat so I wasn't familiar with the install and it was a little confusing to me. (I might be in minority on this because it seems that others had no issues with install). Overall, I would recommend this seat, especially as a slimfit option! Thanks to the Stellar Product Testing Panel for providing me with this car seat.
5 out of 5 stars
3 November, 2024
originally posted on britax.com

So easy to get a secure install
[This review was collected as part of a promotion.] I already had a car seat that was narrow for 3 across use, and while it was a good seat, it had some functional problems in my car. For this reason, I was thrilled to receive this Britax seat for free in exchange for my honest review from Stellar. This seat is exceptionally easy to install. I have 3 kids and I have had many car seats, and this seat so far is right up high on my favorite list. The cover is plush and I love the silver/Grey (I live in a hot place) and though the seat is narrow for 3 across it is not so long front to back that my front passenger seat is unusable (a real problem with the seat this is replacing). I would absolutely have spent my own money on this seat and am really glad we had the chance to try it out.
5 out of 5 stars
3 November, 2024
originally posted on britax.com

Top quality and design
[This review was collected as part of a promotion.] As someone who has purchased ~8 carseats, this was the EASIEST install experience. I didn’t even have to google a how-to video and rewatch it over and over again. It was very intuitive. That said, it’s a heavy car seat so although the install is quick, it’s not a “portable” car seat. The slim design is great, doesn’t feel restrictive or tight for my toddler, and fits in my car with 2 additional car seats/boosters. The fabric is good quality and the seat itself feels plush. Easy to buckle in and out—and the adjustable headrest is great and easy to use. I hiff g hot recommend. I received the product as part of the Stellar Product Testing Panel.
5 out of 5 stars
3 November, 2024
originally posted on britax.com

5 Star Car Seat
[This review was collected as part of a promotion.] I recently received the Britax One4Life Slim All-In-One car seat from the Stellar Product Testing Panel, and I have to say, the overall design really impressed me. The fabric and cushioning feels super luxe, and both my 17 month old (~22lbs) and almost 4 (~38lbs) year old fit in it in rear facing mode very comfortably with no complaints - a tall order! It fits perfectly in my sedan without taking up too much space, which is a game-changer when you’ve got other kids or gear to fit in. Plus, it feels super sturdy and secure, so I know my little one is safe and sound. While I only have 2 car seats in my car, I'm pretty sure I could fit 3 across in my car with this seat. My favorite part was how quick and easy it was to install, with no second guessing myself on if it was tight enough due to the click tight install. The One4Life comes with clear instructions and helpful guides, making it straightforward to set up. I was able to adjust the harness and seat angle quickly to get the perfect fit. It’s reassuring knowing that I can get it right with minimal fuss. While I’m currently using this seat in rear facing mode, I love that I will be able to use this for many years to come for either/both of my children. I love that it will grow with my family, so I won't have to buy multiple seats as my child gets bigger. It’s perfect for busy parents who want something that lasts and adapts to changing needs. One of my favorite features has to be the extended rear-facing option. It gives me peace of mind knowing I can keep my child safe in that position longer. This, combined with the easy install makes the Britax One4Life Slim a winner in my book—comfortable, safe, and easy to use. I highly recommend it to any parent looking for a reliable car seat!
5 out of 5 stars
2 November, 2024
originally posted on britax.com

Wonderful car seat
[This review was collected as part of a promotion.] I received the Britax One4Life Slim All-In-One car seat seat from the Stellar Product Testing Panel and I absolutely love it. As soon as my husband and I took the car seat out of the box we were impressed. It’s lightweight, it looks nice and high end, and it has so many features. I love that it has cup holders for my son’s bottles and that the material is really soft and padded. I also like that the seat fabric is easily washable because my son has figured out how to open up bottles and I’m sure we’ll need to wash the fabric sooner rather than later ha! I will say that the instruction manual was a little confusing and not well organized, but the car seat was fairly easy to install once we figured it all out. I do like that you can install the car seat with the seatbelt and without. Once the car seat was installed it clearly had a much slimmer profile than other car seats I’d seen online and I was really impressed by that because the back of my car isn’t that big so I’m happy I get to maximize as much space as possible. All in all my family really likes this Britax car seat and my husband and I feel really good about my son being in it because it’s well made, safe, and has great features.