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Ships within 48 hours · Estimated delivery Sep 28 - Oct 3
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Description
cybex sirona s flame retardant Nuna AACE Booster SeatFrom cute pre schooler to independent pre teen. Its 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. Theyll enjoy wearing a seatbelt just like you do. And youll be happy because you know theyre safe.
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
Secure
- 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
Comfortable
- 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
- Sleek and chic micro-knit fabric is easy to remove and machine washable
- Included cup holder is removable and dishwasher safe
Accessories
AACE starter kit includes a cup holder, belt positioning clip & a set of LATCH guides (included with purchase)
Usage:
- High back booster
- 40–110 lbs | 43-57 in
- suggested 4 years +
- No back booster
- 50–120 lbs | 43–60 in
- suggested 5 years +
- Seat weight: 15.6 lbs
- Seat dimensions (in): 26 H x 15 L x 21.5 W
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.7 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 5
Nice
Color: Black, Size: 1 Pack
Nice chair. Easy to assemble. Comfortable enough. Arm rests are nice. Would buy again
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Reviewed in the United States on May 19, 2026
★★★★★ 1
total complete junk.
Color: Black, Size: 1 Pack
STOP!!! Do NOT click on Buy. This is simply the biggest piece of **** you've ever seen. Impossible to put together because all the threaded inserts are misaligned. PLUS, it came busted. One of the arm rests was cracked all the way through. And a piss poor design, too. The back attaches to the armrests which in turn connect to the base. Without three or four people, it's simply not possible to put this worthless excuse for a chair together. And don't even THINK about using it WITH the back but WITHOUT the armrests!! Can't do it. Not possible. Terrible design. Seriously, this is right at the top of the list of useless junk I've gotten from Amazon. Not Amazon's fault exactly, they just sell the crap and at least they make it super easy to return this idiotic junk. OK, maybe it IS their fault. Shipped and sold by Amazon so there's that.... Oh, it took over a week to get here, too so there's THAT as well.
Yup, looks like a great deal at first. But....after spending half your life trying to assemble it.... Nope. Not worth one damn cent. Utter absolute junk. Last warning: DO NOT BUY THIS RUBBISH!!! Don't you do it!! Clearly I loved this purchase.
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Reviewed in the United States on May 12, 2026
★★★★★ 5
extremely comfy
I’m in love with this chair. It’s extremely comfy and I can sit for long periods of time without any back pain. It’s easy to move around despite having no wheels. I have a plastic chair mat under my desk and it slides across it easily when I need to move it out of the way. I love the height of this chair as well. I am 4’11 and most chairs even at their lowest setting my feet don’t fully reach the floor comfortably. Usually my legs are leaned forward or on my toes a bit. However this chair at its lowest setting I can perfectly reach the floor and knees are at the comfiest 90 degree angle.
SETUP: The chair was fairly easy to put together. Thankfully I read the reviews or I would’ve been extremely frustrated. The instructions for this are literally 4 steps that make it seem super easy. It is but not because of the instructions. Another reviewer left a video review and said it’s easier to put together if you swap steps 4 and 3 so you can line up the holes on the back with the bottom easier. This is 100% true so thanks for that reviewer!!! I’ll add on - you have to put the back and bottom together at kind of a weird angle to get the holes to line up and start with the back holes first! I can’t even really describe the angle but it feels really wrong. Almost like a wider angle than you think it should ever go. The back of the chair isn’t a 90 degree angle it tilts back a bit. If you can find the angle you’ll get the screws in with very little issue. I put this together by myself in about 5 minutes and 4 of those minutes were figuring out the angle for the back of the chair.
CONS: I only have one con really. It’s the angle of the back of the chair. It’s tilted back just a tad too much for me. I like to be able to sit back in my chair and lean into the back but with this one if I do that I can’t type very well. I think if I add a lumbar support pillow I can lean back comfortably. To me, it’s not a huge deal because of the overall comfort and price of this chair. But something worth mentioning.
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Reviewed in the United States on January 8, 2024
★★★★★ 5
Fuzzy chair
Color: Black, Size: 1 Pack, Color: Black, Size: 1 Pack
Very inexpensive chair seems sturdy and comfy. The arms are a little low. Very stable. I paired more for the mat to go on carpet than the chair! Lol. Only thing is the cair picks up any fuzzies. Im always cold wear robes over clothes no matter what robe I wear it gets fuzzy 🙃 lint roller works but its everyday thing
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Reviewed in the United States on May 21, 2026
★★★★★ 3
Can work, just need to be creative
Color: Black, Size: 1 Pack
The chair itself is comfortable and nice. Castor is very fluid as well as the hydraulic up-and-down.
The problem is the screw sets for the back of the chair. The individuals that made this chair, and from what I see a majority of the other chairs like it, the bolt settings in the back of the chair are not angled correctly for the lumbar support angles. The intelligent, mathematicians, and engineers that have put this chair together did not calculate that lumbar angle. This means that when you try to put the bolt into the nut, you need to have at least a 25° angle for the bolt to fit properly in which the setting is not created for that process.
In the end I ended up being able to get the bottom bolts into the backing of the chair, the top bolts were not able to get the proper angle to secure the chair. This being said, the chair still works comfortable and functional. It just does not have the top two bolts in the lumbar section.
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Reviewed in the United States on May 11, 2026