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Description
cybex sirona i size Cybex Sirona Gi i-Size Plus Car SeatThe CYBEX Sirona Gi i Size Plus Car Seat offers you the ultimate security and comfort so that your little one can relish every moment of their journey, from cosy newborn days to busy toddler years. Plus fabric versions offer additional mesh fabrics for more airflow within the car seat with up to 6 times more breathability than comparable car seat fabrics. The clear choice for comfort in any season. The extended rear facing design ensures safeguarding
The CYBEX Sirona Gi i-Size Plus Car Seat offers you the ultimate security and comfort so that your little one can relish every moment of their journey, from cosy newborn days to busy toddler years. Plus fabric versions offer additional mesh fabrics for more airflow within the car seat with up to 6 times more breathability than comparable car seat fabrics. The clear choice for comfort in any season.
The extended rear-facing design ensures safeguarding up to 20kg, and integrated Linear Side-impact Protection keeps them safe from all angles. Maximum breathability is achieved with innovative air vents on both sides.
Putting your little one in their car seat has never been easier with their smooth rotation handle that allows 360° positioning in any recline position they prefer. With 5 available positions, they’re sure to find their perfect fit ‒ stay comfortably wrapped inside their own private playground throughout the ride. Together with our optional newborn inlay accessory that comes separately, extending their comfort right from day one; your little ones are sure to enjoy every turn and curve along their journey.
Product Features
- Adjustable headrest
- ADAC Test Winner 2023
- Quick + easy onboarding
- Always in a comfortable position
- Grows with your child up to 4 years
- 12 positions allow a tailored fit for your little one
- Designed for your child to sit comfortably rear-facing until they weigh 20kg
- Features ingenious loops designed to keep the harness out of the way as you get your little one onboard
- Linear Side-impact Protection defends your little one against the force of a side impact. The energy-absorbing shell, the L.S.P. System significantly reduces the effect of impact force
- Optimal breathability - The all-around air ventilation of Sirona Gi i-Size allows air to flow through ventilation channels within the car seat, carrying away heat and helping avoid a hot and sweaty ride for your little one
- Straight-forward installation -Use an ergonomic handle to click the ISOFIX into the vehicle seat and extend the load leg down to the car floor. Both provide stability and extra safety in the event of an accident. Visual indicators help you confirm the seat is ready to protect
- Up to 50% higher safety levels - Extended rear-facing, one of the safest ways to travel in a car seat. In the critical first moments of a frontal impact, the child’s body is pushed against the padded car seat shell. This keeps movement to a minimum and reduces the force acting on the child’s neck
Size + Fit
- Weight: 13kg
- Max weight of little one: 20kg
- Measurements: L71 x W44 x H75cm
- Suitable height 61-105cm (from 40cm with newborn inlay)
- Suitable from 3 months up to 4 years (from birth with newborn inlay)
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
4.5 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
The Most Comfortable Office Chair that I've Owned.
Color: Grey
This is by far the most comfortable office chair that I've ever owned or sat in. I've owned quite a few office chairs. Some big and comfy, some new ergonomic designs, some super expensive, others supplied by my employer, and even 2 other/prior Serta chairs. This, by far beats them all. I first purchased this chair for my wife in her office. She's of average size as well, but she always felt like she was being swallowed by some of the larger, more cushiony office chairs. She wanted to be comfortable, but didn't want to drown in the chair. I purchased this chair for her and she absolutely loves it. It's been a year now, and it's holding up well, looks great, and she has zero complaints. Which brings me to my personal purchase for myself. I'm average size. A little bulky, but not too big. I've been through so many chairs. They all feel great initially, but after a lot of use, I felt uncomfortable, or fatigued from sitting, and even sore. I have some lumbar back issues, and my tail bone occasionally gets sore if I sit too long, especially if I slouch over time. I was ready to buy a new chair, and it takes me forever to decide, however I do really like my wife's chair. So I purchased this chair for myself. I must say, that this chair is the best that I've used. It's not huge. You wouldn't be too comfortable trying to nap in it. But for sitting and working? It's amazing. Perfect lumbar support, super soft on the butt without swallowing you, and keeps you straight, and comfortable. I would definitely recommend this product.
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Reviewed in the United States on June 25, 2024
★★★★★ 4
Petite person's perspective
Color: Grey, Color: Grey
Full name on the box: Light Grey Bonded Leather/Mesh Air Executive Chair (Model: 43807)
This review is from a petite female’s perspective
I was browsing for couple months and this Serta chair stood out to me, mainly aesthetically. I don’t see many chairs in this color or style. It matched with the rest of my PC/desk setup.
Positives
-Seat is comfortable.
-Lumbar support is good. It helps me sit very straight.
-The casters were surprisingly easy to put in. I had to use some force with two of them though. They roll fine on carpet.
-Easy assembly
Neutral/Negatives
-Paint of armrests is easily scratched. I accidentally scratched it while installing the back.
-The black plastic caps used to hide the screws don’t fit well. The plastic inserts for hiding screws in arms don’t fit well either. It makes the chair appear cheap. (I will provide images)
-Craftsmanship isn’t the best. Not noticeable from a distance though.
-At lowest setting, my feet can’t touch the ground but being 4’11” it’s to be expected.
-Height of the back is too high for my liking. I prefer a few inches shorter so I can tilt my head back to rest my neck. My fault for not realizing I should look into "mid-back chairs".
-Head/top area is too firm. I prefer it to be squishy (e.g. Serta Smart Layers Verona or Siena).
As another reviewer mentioned, don’t forget to remove the foam or cardboard behind the lumbar and head/shoulder. That is supposedly the last step when assembly is all done.
**If you come across any issues/warranty, you contact TRUE INNOVATIONS, not Serta. (I will provide images)
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Reviewed in the United States on December 21, 2017
★★★★★ 1
***Serta should recall this chair!
Color: Grey
Serta quality and comfortable for office use only, casual home use isn't the same... the only reason I didn't give it 5 stars for ergonomics is that if you are not sitting upright in "office mode" and you want to slouch and relax, the seat makes you feel like you are always sliding forward in the chair? I assume that is because it's an "ergonomic" chair, but it is well built and worth the price in my opinion.
***Updated addition; after using the chair to work from home & casual use, it is still annoying to feel like it tilts forward unless you are sitting up perfectly straight! I have also noticed that if you get up or reposition yourself (due to the forward sliding) the seat height resets itself back up to the top!? So when you sit back down you have to lower the seat again... my last Serta chair never had these issues!! For the price point, this shouldn't be a chair I will be replacing after a few months - but not with another Serta!
****Second update = now 1 star! (Chair still looks new, I only work from home 1 day a week, and take great care of my things so there is no damage or even usage wear) After trying to make the best of this chair, it is even more annoying to use.. it now "groans" when any movement rocking back or forth... it still feels like it is forcing you to slide forward and feels like the chair wants your to fall out! Leaning back doesn't stay (no adjustment to keep from "leaning forward") so no matter what I do, I hate sitting in this chair more every day... and now I am very worried about buying another chair blind online!
***Serta should recall this chair!
*****Third update = Chair still looks and feels brand new, but now randomly will make weird creaking and groaning noises with every movement and as an added bonus it randomly just sinks to the lowest level without warning!!! Typing away and it just starts sinking until it hits bottom!
I don't know how an expensive chair could be so awful!!
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Reviewed in the United States on March 1, 2024
★★★★★ 5
Office chair
Color: Grey
I bought this chair for my son and he’s very happy with the comfort of it.
Very sturdy
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Reviewed in the United States on May 1, 2026
★★★★★ 3
Good chair, Hensley is more comfortable
Color: Grey, Color: Grey
Received chair in a large box and assembly was easy. Instructions call for 2-person assembly but I set out to do as much as I could by myself until someone else was available. No tools needed other than the Allen wrench provided. I assembled the chair in under an hour by myself. The 2 person portion of the assembly was for attaching the seat to the wheel assembly but I managed to attach it myself with some careful maneuvering. The chair is nice and comfortable enough, but I was spoiled by the comfort of trying a different Serta model (Hensley, now discontinued) ina store. I couldn't find that model anywhere else and the floor model was SOOOO comfortable with its Serta Smart Layers. I was hoping Bryce would be a close second. After trying Bryce for a few days, I'd say its a distant third. If I never met Hensley, Bryce might have a higher rating.
Update: based on other reviews, I made covers for the armrests to prevent wear and peeling of the padding cover.
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Reviewed in the United States on November 5, 2025