Nuna AACE Flame-Retardant Free High Back Belt Positioning Booster Car Seat - Coral

Nuna AACE Flame-Retardant Free High Back Belt Positioning Booster Car Seat - Coral
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Nuna AACE Flame-Retardant Free High Back Belt Positioning Booster Car Seat - Lake
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From cute pre-schooler to independent pre-teen. It’s the longest and shortest time, and AACE grows right along with your child. From the fabric to the foam and beyond, each element is smartly sourced to be flame resistant with no added fire retardant chemicals.

The customizable side impact protection pods and belt-path indicators make riding super secure. They’ll enjoy wearing a seatbelt just like you do. And you’ll be happy because you know they’re safe. And comfy. When you have an adjustable headrest, and an extendible, expandable seat with eight recline positions, how could they not be?

3D growth™ system

  • Grow up—one-hand, 9 position height adjustable headrest
  • Grow out—shoulder system works simultaneously with the headrest, expanding out while growing up
  • Grow on—seat sports 3 depths giving growing legs plenty of support and space

2-in-1 design

  • Converts from a high back to a no back booster


  • Energy absorbing foam and SIP pods take side impact security to the next level
  • Belt positioner aids in correct shoulder belt routing and minimizes user error
  • Colored belt path indicators help decrease risk of user error
  • Lower anchor connectors easily secure car seat to vehicle seat during use or transport


  • From fabric to foam and beyond, each element is smartly sourced to be flame resistant with no added fire retardant chemicals 
  • Customizable recline thanks to 8 different positions*
  • Ventilation panels within the shell and breathable (and washable!) knit fabric create a comfy climate for even the longest of trips
  • Little arms can take a break thanks to cozy, built-in armrests

*in high back mode only when using lower anchor connectors


  • Sleek and chic micro-knit fabric is easy to remove and machine washable
  • Included cup holder is removable and dishwasher safe


AACE starter kit includes a cup holder, belt positioning clip & a set of LATCH guides (included with purchase)


  • High back booster
    • 40–110 lbs | 38–60 in
    • suggested 4 years +
  • No back booster
    • 50–120 lbs | 38–60 in
    • suggested 5 years +
  • Seat weight: 15.6 lbs
  • Seat dimensions (in): 26 H x 15 L x 21.5 W
Product Reviews
out of 5.0
158 Reviews
Ratings Snapshot
of Reviewers
Verified Buyer
Yet another amazing Nuna Product
July 2, 2024
Just like all other nuna products - this one is amazing as well. Its comfortable, and super easy to set up. And my kid is able to buckle himself into the seat as well. Super happy with the purchase. Also, the shipping from Albeebaby was super fast!
Lawrence, Kansas
Verified Buyer
Excellent choice!
June 12, 2024
We absolutely LOVE the Nuna line of seats. We graduated from the Rava to the Aace and couldn't be more pleased. As always the quality is top notch. The seat was super easy to install and reels very secure. The cover is easy to wash and reassemble. Definitely would recommend!
Pittsburgh, Pennsylvania
Verified Buyer
May 30, 2024
Amazing! Nuna products are so awesome. so easy to install and one of the safest on the market sooo worth the price point. no regrets!
  • color, comfortable, easy of install
Snellville , ga
Verified Buyer
Snaps come loose on cushion, which is annoying, but not horrible
March 30, 2024
The only complaint I have is that the seat cushion comes undone often. Then snaps aren't very good at securing the fabric. Also, I really wish this had a tether, but I needed a narrow booster and it was between this and Clek. This one had a longer height and weight limit which I ended up going with for that reason alone.
  • RF free, extended use
Best Uses
  • 3 across, good for narrow cars or multiple kids
  • Snaps, poor cushion quality
Verified Buyer
Another great product
February 21, 2024
Another excellent product from Nuna! This is our second Nuna seat and both have been fantastic! I always recommend Nuna to family and friends.
Charlotte, NC
Verified Buyer
Love this booster seat!
February 16, 2024
Love all the Nuna carseats. Just got this for my 6 year old and she is happy in it and I know she is safe.
Norton, Massachusetts
Verified Buyer
Fast delivery
February 12, 2024
We have been a Nuna family for quite some time now and the AACE booster seat didn't disappoint. It's very well made and super comfortable. My daughter loves her new seat.
Verified Buyer
Must buy
February 8, 2024
Great buy. Super easy to install
  • Sleeps nicely , leans back .
Verified Buyer
Best Booster seat ever!
January 25, 2024
Love this booster seat!!! My sons head doesn’t fall forward when he’s sleeping and it’s very comfortable
  • Style and comfort
  • No belt clips for the seatbelt
Grand Rapids, Michigan
Verified Buyer
Another great Nuna Product
January 15, 2024
Love Nuna products and this is no different! Love the easy latch install and my daughter is comfortable and safe in her first booster seat!
Chicago il
Verified Buyer
Love it !
December 9, 2023
Love it !
Verified Buyer
Lightweight and Comfortable
November 27, 2023
This seat is beautiful and extremely comfortable to use. It installs easily and is lightweight enough for a child to carry. Great addition to the car!
Merrimack, New Hampshire
Verified Buyer
A Must!
November 8, 2023
Love this seat! We went from the Nuna Rava to this, and its just as amazing as the Rava! So easy to install and very comfortable. Also feels very secure and safe! Highly recommend!
  • Easy Install
Ottawa, IL
Verified Buyer
Easy to install
November 4, 2023
Seat is very easy to install, fairly light weight and my child says it’s very comfortable
Nashville, TN
Verified Buyer
Will definitely buy again! Twice.
September 20, 2023
We love this carseat. We have two other children who will soon be tall enough for this seat and we fully intend to buy this seat again for both.
  • Easy to install. comfortable. FR free
  • none
New Jersey
Verified Buyer
Great Seat, Daughter Loves IT!
August 21, 2023
Very comfy for long trips. So easy to get in and out of cars.
Palmetto Bay, FL
Verified Buyer
Favorite Booster
July 29, 2023
I got this seat for my tall four-year-old that still needs full back support but is getting too tall for the standard convertible car seats. Aside from saftey the main postive of this car seat is comfort. This seat is able to recline which allows for naps on long car trips comfortably. My daughter loves this seat, and I ended up getting one for both of my cars. It is also very easy to transfer to different cars. The only negative is the cup holder. It's a little bit on the small side and when my daughter pulls her drink out it tends to pull the entire cup holder out. Also, this seat is roomy and comfortable, which also means bulky, would be hard to fit three seats across a standard row.
  • Comfortable for long car trips, reclines, child can sleep easily with support.
  • Cup holders are small and pop out constantly
Verified Buyer
Best Booster I’ve ever seen!
July 22, 2023
Love this booster!!
Orange County
Verified Buyer
Easy to put it on by just clicking on
July 9, 2023
It’s much better than the other brand car seat, but the click handles are small and not super easy to reach.
  • The one click mount design is very good compare with other car seat
  • The click handles are small and if it is big and easy to reach will be great
Summerville, SC
Verified Buyer
Works like a Nuna!
June 1, 2023
Simple and works just like all other Nuna products. High quality and easy to use/set up. Review about the cupholder may be a little off. We use the kids Camel Bak bottles and they fit perfectly in the cupholder.
Verified Buyer
Installation is everything!!
May 31, 2023
My favorite high back booster ever! Easy to install, lightweight, and not bulky at all.
Laurel, Md
Verified Buyer
Family Favorite
May 23, 2023
My two adult daughters love these car seats and boosters. Both of my grands (4 and 6) can jump into the car, scramble into the 3rd row seat and buckle up by themselves. The seats are comfortable and clean up well,, too.
Potomac, Maryland
Verified Buyer
May 16, 2023
This is a perfect carseat for my 4 years old boy, it is easy to be assembled and cleaned, with a high quality, I would like recommend this to you all.
Chicago, IL
Verified Buyer
Recommend Purchase
May 6, 2023
Booster arrival as described. No issues with installation and has been comfortable for child. Would recommend purchase..
New Jersey
Verified Buyer
Nuna Booster seat
May 3, 2023
Beautiful color and comfortable for my child, this booster seat is easy to use and secure.
Harrisburg, Pennsylvania
Verified Buyer
Excellent booster! Worth it - I'm buying another.
April 26, 2023
Very happy with this purchase! It is a very hefty and comfortable seat that has made entry and exit from car even easier for my 5 year old.

Its a pricey seat compared to big box stores - but for FR free, through and through (not just certain parts) there is an expense. Fortunately I use Albee Baby's rewards program over the years and it has saved me a bundle.

I came to the site to buy a second one of these for my husband's vehicle.

  • Totally Flame Retardant Free! This was a must for our family.
  • The adjustments are simple.
  • The SIP (side impact protection) is a definite perk for a booster.
  • Uses Latch for securing the seat
  • Includes cup holder
  • Seat belt glides easily through the guides and stays where you want after use.
  • Comfortable top to bottom, no complaints from son.
  • Instructions are simple to follow
  • ... no Cons found!
Colorado Springs, Colorado
Verified Buyer
Great seat
April 12, 2023
7 year old is very comfortable in his Aace
Hallandale beach, Florida
Verified Buyer
best cr seat
March 11, 2023
my favorite car seat
Ruby B.
Houston, TX
Best seat in town!
March 6, 2023
My son is about to be 5, with tge body of a 7yr old. I bought him another brand toddler seat before this one. When i would turn that past seat would tilt, his head had no support, his head was so unprotected. I was very concerned, after much research, and asking other moms about their chairs, I was convinced that the nuna was the best option for us. It really is, this chair is not going anywhere, it doesn't tilt, it offers the best head support so he easily goes to sleep while i drive. He is comfortable and happy, and most of all safe. Thank you for inventing this seat, you really did consider our babies safety and provided comfort for them in their daily commute. From a very satisfied Toddler and Mom!
This product review was collected by the manufacturer.
Verified Buyer
Wonderful color and design
February 23, 2023
Absolutely love everything about this seat!
Laura L.
Stafford, VA
6 years and 2 Aaces!
February 2, 2023
Really good booster compared to other brands. The seat is well padded. It's not as compact as Diono, but my 6 year old prefers his Nuna booster to his Diono booster based on seat comfort alone. The cup holders fall out easily, but that feature isn't necessary since our 4 and 6 year olds are big enough to reach our SUVs built in cup holders. Installation and removal is fairly simple. My 6 year old has been able to buckle himself for the last year, my 4 year old still need some helps
This product review was collected by the manufacturer.
North Carolina
Great seat
January 23, 2023
I love this seat! My 7 y/o son is on the smaller side and it was more difficult to find a booster seat that fit his measurements. This seat has been great for his size as well as for his confidence. I will say that I found the assembly instructions to not be that great but the install was very easy. I ended up watching a YouTube video in order to assemble and install.
This product review was collected by the manufacturer.
Oakland, CA
Verified Buyer
Nuna AACE is a comfortable seat and should fit tall kids for a long time
January 17, 2023
After extensive research, I purchased the Nuna AACE for my 5yo, who is in the 95th percentile for height.

What I like:
- tall 5yo is very comfortable in it, as is my petite 8yo.
- It will fit both of them for a long time (big reason for splurging for this seat)
- the seat pan can be lengthened as they grow, not just the shoulder space and head rest.
- rigid latch, and comes with latch guides - in our car, the LATCH bars are difficult to reach and the guides are VERY helpful!
- flame-retardant free fabric
- seat belt is a good fit on both kids (and is rated best bet for belt fit in any car by the IIHS)
- can be used without a vehicle headrest
- can be reclined for comfort when sleeping (not just vehicle seat fit)
- when my 5yo has fallen asleep in it, the seat keeps him upright and belt path remains optimal

What I don't love but aren't deal-breakers:
- upper seatbelt guide could be tighter/harder to undo - in our car at least, the belt gets twisted and comes out when unbuckled with almost every ride
- rigid latch is rigid, but has a hinge that makes it slightly less easy to line up with LATCH than our other boosters
- no metal in the frame (I know this is isn't necessary and asking for it is probably overkill, but it would still make me feel better!)
- the headrest connection has a lot of give when extended. While the manual states that the AACE can be used without a vehicle headrest (another reason I got it - our old car does not have them in the back seat), it doesn't feel sturdy to me without something behind it.

That being said, though I haven't found *the* perfect booster yet for my family, I like the AACE better than the other two seats we have, which are Peg Perego Flex (for travel) and Clek Oobr. In the Flex, both kids say because the headrest is so thick, it pushes their heads forward, though it's great for folding up and taking on a plane (it has to be checked but at least isn't an oversized item), and should still adjust to fit my tall kid for a long time. The main complaint with the Oobr is the short seat pan - for both kids, almost 3-4" of their thighs are unsupported by the seat in high-back mode, and they tend to scoot their bottoms forward from the seat back to compensate. Once they're old enough to ride backless, it shouldn't be a problem, but that's a long time to go with a less than ideal fit.
  • - high height and weight limits with shoulder, headrest and SEAT PAN adjustments that actually allow up to these limits - seat will fit tall kids comfortably for longer than your average seat (and longer than some others that claim these same limits)
  • - IIHS best bet for seatbelt fit in any car (both in HBB and without the back modes)
  • - converts to a backless booster
  • - flame-retardant free fabric
  • - comfortable padding and fabric
  • - rigid LATCH with LATCH guides
  • - can be used without a vehicle head rest (in cars that don't have them, or where the vehicle headrest interferes with a good fit to the booster, aka almost any newer vehicle where the headrests tilt forward)
  • - can be reclined for comfort (not just vehicle seat fit)
Best Uses
  • - Tall/larger kids (though also very comfortable for smaller kids)
  • - where you don't need to fit 3 seats across
  • - if you need to install in a position without a vehicle headrest, or where the vehicle headrest tilts so far forward as to create a gap between the booster and the seat, and can be removed.
  • - hinge in rigid LATCH makes it a little more difficult to install with LATCH than other seats where the LATCH retracts straight back into the seat
  • - shoulder seatbelt guide doesn't keep the seat belt in line when unbuckling, so it needs to be untwisted and put back into the guide almost every ride
  • - because it is designed to fit larger kids for longer, it is too wide for 3-across installation
S t.
EASTVALE, California
Verified Buyer
The BEST car seat!
January 2, 2023
Easy to install and lightweight.
Verified Buyer
December 16, 2022
Amazing! We love our Nuna car seats! The color is beautiful!
Verified Buyer
Dont buy
December 16, 2022
Dont buy. I would have bought 2 more of these seats but the cup holders are too small to fit a very common kids water bottle like a Contigo. Very annoying. Now we cant have water in a cup holder. Come on product development do better!
LOVE, minus one smaller adjustment
November 19, 2022
Overall LOVE this car seat! Giving it 4 star only bc the cup holder isn't big enough for my daughter's water bottle (annoying). I hope they make it a bit bigger before we purchase our next one soon.
This product review was collected by the manufacturer.
Ann Arbor, MI
Verified Buyer
Love nuna
November 17, 2022
3rd nuna car seat. Can’t go wrong with them. We Love them
Kim B.
Worth the wait
November 17, 2022
We love it! We upgraded our daughter from a NUNA convertible seat that she was very happy sitting in, and her booster is just as comfortable for her. Plus it installs very securely in the car which makes me comfortable as well. Love that she can grow into the backless booster as well.
This product review was collected by the manufacturer.
starke, Florida
Verified Buyer
Nuna rocks
October 12, 2022
Our favorite booster seat. My girls reached the height restriction on their 5 point and we wanted to keep them safe and secure still. This is the perfect option. Easy to use and comfy for my girls!
Walden, New York
Verified Buyer
I don’t choose car seats/ boosters easily-
October 7, 2022
Transitioning to a booster seat is not my favorite milestone in childhood. Nuna has helped make that transition easier. This seat is SOLID; unlike the flimsy versions I often see in big box stores. I like that it latches into the car, offers SIP, reclines and GROWS in all directions for a proper fit. We are slowly becoming a NUNA family& will purchase another one of these boosters in the future.
  • Solid
  • Secure
  • Comfortable
Best Uses
  • Big kids
  • None
Greenville, South Carolina
Verified Buyer
We’re a Nuna Family
September 28, 2022
Another great product from Nuna. We have brought our kids up with Pipa, Rava, and now the Aace. We love the functionality., looks, and of course safety that Nuna provides. Very happy with this booster!
Fort Lauderdale, Florida
Verified Buyer
September 28, 2022
Best booster seat ever! Nuna is my go to brand!
Verified Buyer
On the fence? Don't be! Nuna is the way to go!
September 16, 2022
We used Clek car seats and were really sold on staying with Clek for our booster upgrade, until I heard they were uncomfortable. That really stuck with us, and we started researching other options. We came down to the Nuna AACE and the UPPA Alta. We chose Nuna for a few reasons -- comfort, head support, quality, and the ability to convert it to a non-back booster when the time comes. The uppa option did not have the 2-in-1 feature and while it cost less, it meant having to buy a 3rd seat down the line which didn't make sense for our family.

The Nuna installed easily, the quality is evident, the "grow with me" feature is awesome and my kiddo says it's comfortable.

He does feel like the arm rests make it harder to buckle the seat, and he's pretty skinny so the fact that you have to grow it width wise when you raise it doesn't really help him. Only other "complaint" is that the cup holder is SMALL. It fits a standard kids water bottle (thermos funtainer) but does not fit wider bottles (like a yeti/hydro/etc), so we're trying to find an adapter.
  • Comfort
  • Head support
  • Quality
  • Ability to convert it to a non-back booster
  • Small cup holder
  • Arm rests can make it harder to buckle
Naples, Florida
Verified Buyer
Love Nuna boosters!!
August 24, 2022
We just converted our 2 boys over to the booster seats. We purchased 2 to try them out and the boys love them. I love that these booster seat are secured into the seat. My 5 year old has no problem buckling himself in and getting out when he needs to.
  • Easy to install
  • Secure and safe
  • Comfortable
  • Lightweight
  • Easy to clean
  • Wish the cup holder was like the ones from the Rava.
Verified Buyer
Fantastic Booster
August 20, 2022
Awesome seat! Very comfy, love it!
Pittsburgh, PA
Verified Buyer
High quality booster seat
August 18, 2022
We transitioned from the Nuna Rava carseat to the booster. Easy to install, sturdy, comfortable, and looks great. The way the cupholder attaches to the seat is a little flimsy. Other than that, can't complain!
Verified Buyer
August 14, 2022
such a great purchase
Hamilton, Massachusetts
Verified Buyer
Another amazing nuna product
July 29, 2022
This is our 4th nuna car seat purchase and I couldn’t be more pleased. Easy to use and setup, will definitely be ordering a second one for our other car.
Verified Buyer
Great overall booster!
July 25, 2022
My child loves it! Comfortable.
Customer Q&A