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Description
cybex sirona s urban black Cybex Sirona S SensorSafe Convertible Car Seat – Twinkle Twinkle Little OneThe CYBEX Sirona S is the ONLY convertible car seat to feature a 360 swivel seat with a load leg, linear side impact protection, and SensorSafe technology. Built into the chest clip, SensorSafe provides real time in app alerts when potentially unsafe situations arise including if a child unbuckles the chest clip, if the back seat becomes too warm or too cold, and if the driver unintentionally leaves the child behind. These features offer advanced
The CYBEX Sirona S is the ONLY convertible car seat to feature a 360° swivel seat with a load leg, linear side impact protection, and SensorSafe technology. Built into the chest clip, SensorSafe provides real-time in-app alerts when potentially unsafe situations arise including if a child unbuckles the chest clip, if the back seat becomes too warm or too cold, and if the driver unintentionally leaves the child behind. These features offer advanced safety protection for children and greater peace of mind for parents.
- ONE-HAND 360° SWIVEL SEAT: For easy loading and unloading of your child
- LOAD LEG: Absorbs energy and reduces crash forces on the child by up to 30% in a front impact collision*
- ONE-TIME VEHICLE BELT INSTALLATION: Allows seamless transition from rear-facing to forward-facing mode without having to re-install
- EASYLOCK™ BAR: Reduces force needed up to 4x for quick, simple and secure installation
- SENSORSAFE TECHNOLOGY: Bluetooth enabled chest clip sends mobile app alerts if a child unbuckles the chest clip, if the back seat becomes too warm or too cold, and if the driver unintentionally leaves the child behind
- 12-POSITION ON THE FLY RECLINE: Adjust even when the seat is in use
- LINEAR SIDE-IMPACT PROTECTION (L.S.P.): Reduces collision forces by up to 25% in a side impact crash*
- ANTI-REBOUND BASE: Reduces rebound forces in a rear or front impact crash
- REAR-FACING LONGER: Up to 50 lbs.
- MAGNETIC BUCKLE HOLDERS: Keeps harness out of the way for easy loading and unloading of your child
- DISHWASHER SAFE CUP HOLDER: Can be positioned on either side of seat
- 12-POSITION ADJUSTABLE HEADREST: Harness adjusts with the headrest for a proper fit as your child grows
- DUAL-LEVEL INDICATORS: Clearly indicate the proper car seat angle from either side of the seat
- STEEL REINFORCED FRAME: Provides strength and durability
- 3-POSITION PADDED BUCKLE: Allows for a secure fit while providing extra comfort for your growing child
- REMOVABLE INFANT INSERT: Ensures proper fit and support for babies
*As compared to the same car seat without this feature
Usage
- Child Age Minimum: newborn
- Child Age Maximum: 8 years
- Child Weight Minimum: 4 lbs.
- Child Weight Max: 65 lbs.
- Rear-Facing Mode Weight Limitation: 4-50 lbs.
- Rear-Facing Mode Height Limitation: 17"-49"
- Forward-Facing Mode Weight Limitation: 22-65 lbs
- Forward-Facing Mode Height Limitation: 28-49 in
- Forward-Facing Mode Age Limitation: at least 22 lbs
- Forward-Facing Mode Fit Limitation: top of ears below the top of the headrest
Specifications
- Dimensions: 24.5"D x 19"W x 25.5"H
- Weight: 30.4 lbs.
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
4.1 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Finally a Chair That Fits and Feels Great
Color: Black, Style: With Headrest
I recently purchased the Marsail Ergonomic Office Chair, and overall, I couldn’t be happier with it.
First off, assembly was incredibly simple. It took me about 30 minutes from start to finish, and the instructions were clear and easy to follow. All the parts were well packaged, and I didn’t run into any issues putting it together.
For reference, I’m 6'2" and about 275 pounds, and this chair fits me very well. As a bigger guy, finding a chair that feels supportive and appropriately sized can be a challenge, but this one hits the mark. The seat is roomy without feeling oversized, and the overall build feels sturdy and solid.
Comfort-wise, it’s been excellent. I work from home and spend about 8–9 hours a day in this chair, five days a week. The thick cushion seat really makes a difference, it stays comfortable throughout the day and doesn’t feel like it’s flattening out after hours of use. I also really like the mesh back. It provides good support while allowing airflow, which helps keep me cool during long work sessions.
The only feature I wish it had is a recline lock at multiple angles. Currently, it only locks in the fully upright position. It would be great to be able to lock it slightly reclined for more flexibility during long workdays.
That said, for the price, ease of assembly, and all-day comfort, this chair delivers tremendous value. I’m giving the Marsail Ergonomic Office Chair 5 stars and would definitely recommend it to anyone looking for a comfortable, supportive office chair, especially if you’re on the taller or bigger side like me.
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Reviewed in the United States on March 2, 2026
★★★★★ 5
This is a terrific office chair at a great price!
Color: Dark Blue, Style: pack of 1
Easy to assemble, with comfortable armrests, lumbar support, and all the functions...it can rock, recline, roll and swivel, plus the seat control easily adjusts up & down, and it comes in a variety of colors. This is my best Amazon purchase ever!!
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Reviewed in the United States on May 22, 2026
★★★★★ 5
A Solid, No-Frills Office Chair That Gets the Job Done
Color: Black, Style: pack of 3
I bought the BestOffice Home Office Chair Ergonomic Desk Chair because I needed something affordable and functional for our conference room. I wasn’t looking for anything high-end—just something comfortable enough to get through staff meetings without complaints of sore backs.
Out of the box, assembly was pretty straightforward. It took me about 20–30 minutes, and the instructions were clear enough that I didn’t run into any major issues. Once set up, the chair feels lightweight but stable, and it rolls smoothly across the low pile carpeted office floor.
The mesh back is probably the best feature. It keeps airflow going, which makes a big difference if you sit for long periods or in a warmer environment. I’ve had padded chairs before that trap heat, so this was a noticeable improvement right away.
The lumbar support is decent for the price. It’s not adjustable in a high-end sense, but it does help encourage better posture and reduces that “slouching into the chair” feeling over time. The armrests are basic, but they do the job for light support.
Comfort-wise, it’s good for moderate use. I can sit in it for a few hours at a time without discomfort, but if you’re planning to sit all day every day, you might want something with more padding and customization.
A few drawbacks worth mentioning:
The cushioning is on the firmer side and I worry may wear with extensive use
The chair is more budget-oriented in build quality
Adjustability is somewhat limited compared to higher-end ergonomic chairs
That said, for the price, it delivers exactly what it promises. It’s a simple, functional office chair that covers the basics without overcomplicating things.
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Reviewed in the United States on March 23, 2026
★★★★★ 4
Good chair and great value, comfortable
Color: Dark Black, Style: pack of 1, Color: Dark Black, Style: pack of 1
The chair is as you expect for this price range
The only Issue is the thigh length is shorter then I thought but still works. The air fabric helps
Keeps it cool to sit in for long periods without sweating
It’s a great chair to sit in for 8 hours as I usually do writing and project planning at my desk.
Over all the assembly was simple and all
The instructions were there with the tools as well.
It rolls fine on my vinyl floor. It’s definitely value for your money on this one and the over all design is fine and works to me at this point.
It don’t have squeaky tires so the noise is good rolling around
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Reviewed in the United States on January 28, 2026
★★★★★ 5
Great value
Color: Red, Style: pack of 1, Color: Red, Style: pack of 1
Easy to put together. Only tough part was getting the wheels on, needed someone strong to attach them. Once together it is a great chair. Height adjusts up and down easily and rolls smoothly. Sturdy chair and the red looks great!
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Reviewed in the United States on June 11, 2026
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