"Recently had lumbar back surgery so was looking for something supportive but without pressure directly on the spine. This was perfect, although I regret not getting the foot rest."
Doro S300 · Sold in Australia since 2021
Most chairs feel fine for an hour.
This one was built for hour seven. The seat rides on four steel springs, so it moves when you move instead of waiting for you to sit still.
$949
$1,599
· free delivery Australia-wide, 1 to 5 days
4.9 average
from 78 owners
3-year warranty
Comprehensive parts protection
Fits 150 to 190cm
Adjustable height and depth
SGS certified
Independent safety and durability verification
The Sitting Crisis
Hours of Sitting shouldn't be an Endurance Sport
You know the moment. Somewhere after 3pm you catch yourself on one hip, leg folded underneath you, chin two inches from the keyboard.
That is not willpower. It is your body running out of patience with a chair that has asked it to hold one shape since nine in the morning.
Most chairs are built to feel supportive in a showroom. Firm foam. A fixed lumbar bump the size of a tennis ball. That feels reassuring for forty minutes. By hour four it is a splint.
The Part Under the Seat
Four steel springs, one job: stop making you hold still
SIHOO calls it the anti-gravity system. Strip the marketing off and it is a sprung floor under the seat, which means the chair absorbs your movement instead of resisting it. Everything below is just how that is built.
1
The seat floats on four springs
No foam squashing against a hard base. Drop into it and four coil springs take the landing instead of your tailbone.
2
The recline is calibrated to your weight
Glass fibre plates set the tension across a rated 40 to 100kg range. Someone at 60kg and someone at 95kg both get a recline that holds. Neither touches a dial.
3
Two lumbar pads move independently
Most chairs aim one fixed bump at an average back. This uses two wing-shaped pads on a gas lift, so you set the height to your lower back instead of sitting where the bump happens to be.
4
The upper back adjusts separately, in five positions
Shoulders and neck get their own setting, independent of the lumbar. This is what makes one chair work at 155cm and at 188cm.
Precision Spring Assembly
A refined balance of tension and support, engineered for sustained comfort across long work sessions.
Spring Mechanism
Glass-Fibre Base
Lumbar Support
Mesh Weave
47 to 55.5cm
Seat height range
40 to 47cm
Seat depth, adjustable
100° / 110° / 130°
Three locked recline angles
40 to 100kg
Recline tension range
Everyone asks this first
Will it actually fit you?
More people ask this than anything else. Straight answer, before you get near a cart.
Cris F.
Verified owner
★★★★★
"The most comfortable office chair I have ever owned. I can sit in it for hours without any back or shoulder pain, unlike my old cheap chair. Very easy to assemble, and didn't take long to adjust to my height and size."
If you are over 193cm (6 foot 4): be careful.
An Australian reviewer close to two metres tall still rated this chair 4.8 out of 5, and was direct about the risk: people above six foot four will want a deeper and taller seat pan than this one has. We would rather tell you now than process a return later.
VIDEO
Three people who took it apart before you did
You cannot feel a recline through a screen. You can watch someone else lean back in it. None of these are ours.
REVIEWS
Owner reviews
"Worth the extra money over cheaper chairs" Matt H.'s words, not ours. Here is the rest, including the one that complains.
"Seamless transaction. Easy to assemble. Provides excellent ergonomic support for long consulting days with much leaning forwards to examine patients."
"I am so glad I decided to retire my faithful old leather recliner made locally 22 years ago with the S300. I've lived in it since it arrived 4 weeks ago."
"Very happy with the chair as I'm able to adapt many things especially the lower back support. The main thing I find annoying is how the arm rest's swivel as I find myself knocking them out of place."
"The chair is comfortable and is well made with good support systems. The order arrived quickly and was well packaged and sealed simple to put together."
"Great for my lower back. That's the main reason for purchasing this model. Had it for over a week and it's great. Worth the extra money over cheaper chairs."
PRESS & MEDIA
Independent reviews
We did not pick the friendliest reviews
You have already found these. Here they are, criticism included.
ERGOLAB
Score: 4.8 / 5
Rated it 4.8 out of 5. On the seat height ceiling, which is our most-asked question: it is "roughly on par with industry standards and will cover 95% of users."
CHAIR CRITIC
Highly Rated
"The overall adjustment range is wide and should fit users up to about the 80th percentile." Called the recline class-leading for the price.
TECH VERDICT
Recommended
Verdict: Recommended. Five stars for design, ease of use and practicality, four for price. Their one real complaint was the armrests.
BEFORE YOU BUY
Five things you will not like about this chair
All five come from independent reviewers or verified owners. You will find them in your next tab anyway.
1
The armrests do not lock.
Lean on one and it swivels. Three reviewers and at least one owner named this as their main annoyance. If you rest real weight on armrests, it will bother you daily.
2
Three recline positions, not infinite tilt.
100, 110 and 130 degrees. Forbes wanted the angles in between and could not get them.
3
The headrest is part of the backrest.
A tall, well padded back, not a separate adjustable headrest. If that is a must-have, wrong chair.
4
Over 6 foot 4, the seat pan runs short.
Covered in the fit check above. Fits most people well, very tall people adequately.
5
Assembly takes about 45 minutes.
Owners call it easy, not quick. Some parts are heavy enough that a second person helps. Do not start it at 11pm.
The honest offer: most people who sit all day call it the most comfortable chair they have owned, but you will spend 45 minutes building it and you will knock the armrests out of place. Across 78 reviews that pattern is consistent, not universal.
41% off
81 reviews
SIHOO Doro S300 Ergonomic Office Chair
$949.00
$1,599.00
Unit price
/
Unavailable
HIGH DEMAND
Extended dispatch: Please allow an additional 5–7 business days before your order is shipped.
Free shipping with delivery in 1-5 days
3-Year Warranty
30-Day Returns
Free Shipping
It will still be 4pm tomorrow. The only question is whether you spend it folded onto one hip again.
Free delivery in 1 to 5 days. Three-year warranty. And if you are over six foot four, we told you not to.
COMMON QUERIES
Questions people search before buying this chair
Every question below is taken from real search queries landing on this page.
Seat height range: 47 to 55.5cm on the gas lift, with seat depth from 40 to 47cm. Those two set the supported range of 150 to 190cm.
Weight capacity: 136kg, BIFMA tested. Two different numbers matter here: 136kg is what it holds, 40 to 100kg is where the weight-calibrated tilt still works as designed. Above roughly 90kg the springs compress most of the way, so you get a firm supported seat rather than a floating one.
Shipping: 1 to 5 business days, free, Australia-wide. (confirm current dispatch window and warehouse location before launch)
The C300 is the lighter, simpler chair. The S300 adds the four-spring seat, 6D armrests, dual gas-lift lumbar and the deeper 130 degree recline. Under four hours a day, take the C300. Eight or more, the suspension is what the extra money buys.
An Aeron holds its resale value and runs a twelve-year warranty. The S300 costs about a quarter as much, and reviewers consistently rate its recline as class-leading at this price. Want the badge and the twelve years, buy the Herman Miller. Want most of the ergonomics for a quarter of the money, this is a serious option.
Armrests: No. They adjust in six directions and swivel if you lean hard on them. It is the most common criticism in both independent reviews and our own, and we are not going to pretend otherwise.