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Sihoo Doro S300 ergonomic office chair review

The Sihoo Doro S300 chair is out of this world. With an Anti-Gravity Mechanism and adjustments galore, it's Sihoo's best chair yet.

Sihoo S300 ergonomic office chair review image showing the chair in someone's home, with a cat at the bottom left.

Our Verdict

If you're after a premium office chair, the Sihoo Doro S300 is the one to go for. Constructed from mesh, Italian velvet, and DuPont TPEE, it offers luxurious comfort akin to "cloud-like" softness, it's arguably the most comfortable chair you'll find. With an Anti-Gravity Mechanism made of aerospace-grade materials and adjustable height, seat depth, and a three angle recline, it's easy to get it just the way you like. You can make this chair your own and I've never known another to offer such great comfort and ergonomics.

Reasons to buy
  • Comfortable design
  • Looks fantastic
  • Many adaptable options
Reasons to avoid
  • Expensive
  • 6D armrests are disappointing
  • Castors could be better

The Sihoo Doro S300 is the company’s most advanced ergonomic office chair. It’s been engineered to provide high comfort levels with a cutting-edge Anti-Gravity Mechanism, and it’s the top-tier model in Sihoo’s lineup. But does its premium price deliver an unmatched sitting experience for working and gaming?

Winner of the 2023 German Design Awards, the Doro S300 surpasses the highly acclaimed Sihoo Doro C300. With an advanced set of adjustment options that enable you to make the chair your own and an adaptive design that compliments your body shape, is it one of the best office chairs on the market? I’ve been sitting in this luxury Sihoo for several weeks to find out.

Why you can trust our advice ✔ At PCGamesN, our experts spend hours testing hardware and reviewing games and VPNs. We share honest, unbiased opinions to help you buy the best. Find out how we test.

Sihoo S300 ergonomic office chair review image showing its parts mid-assembly.


Sihoo S300 ergonomic office chair specs:

Maximum weight 136kg
Recline 100, 110, and 130 degrees
Upholstery Italian velvet mesh, DuPont TPEE
Warranty Extended five years
Weight 26.2kg
Dimensions 74 x 67 x 127cm

Sihoo S300 ergonomic office chair review image showing the assembly instructions.


The Doro S300 arrived in a large cardboard box- which my cats love playing in. Although the delivery driver couldn’t carry it up to my flat on the second floor, I managed to do it myself, despite its heavy weight. The chair came well-packaged, with plastic covers protecting the backrest and seat pieces, while bubble wrap and cardboard safeguarded the rest. To distinguish the left armrest from the right, Sihoo uses red and white bubble wrap, and each arm is clearly labeled should you remove the packaging. Every component arrived in perfect condition.

Assembling this chair is incredibly easy, with fewer, simpler steps than you find with cheaper models like the C300. The assembly process consists of six steps spread over two pages, with a key assigning letters to each part. This makes the picture instructions detailed but not overwhelming. The brief text, combined with the images, provides clear guidance. This was a pleasant contrast against the C300, which had nine instructions crammed into one page with no key and was a little too complicated for me.

No additional tools are needed to assemble the S300. The chair comes with a packet of bolts and washers, along with a T-wrench- and even a pair of gloves to protect your hands. The packet clearly labels each component and divides them into sections for each step, including a spare for each. However, there was a moment of confusion when I found a random bolt that was completely different and must have been accidentally included. For a brief moment, I thought I had missed something.

Sihoo S300 ergonomic office chair review image showing the back side of the chair.


The Sihoo S300 has a kind of futuristic look to it. The chair is advertised in space–which makes sense with its Gravity-Defying Mechanism–often shown by a window looking out into the cosmos. It doesn’t look out of place there, but then again the chair fits nicely into any space, whether modern, cozy, or any other decor. It also comes in both black and white. One complaint is that the chrome back panel has a large area where dust and dirt tend to accumulate, necessitating frequent cleaning.

The Sihoo S300 is made from mesh materials combined with Italien velvet and DuPont TPEE, offering what Sihoo describes as “cloud-like comfort.” I found it surprisingly soft to the touch– feeling more like fabric–and has high elasticity, durability, and pressure-relieving properties. This chair not only looks and feels good but also offers numerous benefits. Interestingly, my cat happily sleeps on the S300 but avoids the C300.

There are four controls located on the right-hand side, which are convenient for right-handed users but might be less intuitive for left-handed individuals. Initially, the controls appeared overwhelming. (I am used to one lever which changes the height). Upon closer inspection, I noticed that each lever/ knob has a drawing explaining what it does. But, even after several hours of sitting in this chair, I still occasionally need to check the controls to remind myself of their functions.

Sihoo S300 ergonomic office chair review image showing all the adjustment knobs on the chair.


The Sihoo S300 is engineered to perfection, featuring an Anti-Gravity Mechanism with aerospace-grade glass fibre elastic plates—used in spacecraft! It offers adjustable tension via a knob, accommodating users of all sizes. You can recline smoothly at three different angles and lock your preferred position securely with a dial. This feature is especially beneficial for those like me who need regular stretches and dislike unexpected reclining mid-stretch.

This chair prioritizes comfort with customizable features. Adjust the height (47-55.5cm) and seat depth (40-47cm) to suit your legs. Its shock-absorbing, pressure-relieving seat dynamically adapts as you move. The wing-shaped dual dynamic lumbar support is easily adjustable via a lever on the back. It features a high back and spacious headrest that moves up and down smoothly, with reliable resistance to prevent slipping at maximum height.

The Sihoo S300 has 6D armrests, meaning it offers adjustments in six directions. The idea is to guarantee optimal arm support no matter how you sit. The armrests go; up and down, back and forth, in and out, inward, outward, and upward, coordinating with the backrest so that when you recline the arms move with you. The armrests are made from a comfy padded material which feels nice on the elbows. While playing Stardew Valley, my cat curled up in my lap. I raised the armrests to avoid squishing him, but it took some adjustment to keep them in position. Unfortunately, without a button release or locking system, they move unintentionally. Similar to the C300, the armrests are a weak point of this chair. Despite their versatility in movement, their lack of stability undermines their functionality.

Sihoo Doro S300 ergonomic office chair review image showing the chair from the front, with the arms in the centre of the frame.


The Sihoo S300 performs wonderfully. I prefer a low chair that allows my feet to touch the floor, with ample seat depth so I don’t have to perch on the edge. I appreciate a good recline for when I fidget and need good neck support. As an average-height person with curves, I found the Sihoo S300 perfectly adaptable to my needs. Height adjustment ticked the box.

The tension wheel provides just the right amount of recline resistance, and the adjustable seat depth is a fantastic feature that provides exactly what I want. The neck support is excellent– especially for a headache sufferer like myself. It’s a pity there are only three recline positions; more options would be welcome. But overall, I found that I could sit in the S300 for hours without discomfort.

One downside I noticed is that the chair didn’t glide as smoothly across the carpet as I had hoped. Its hefty weight, combined with mine, makes it less agile. I couldn’t help but wonder if rollerblade wheels might be a better choice over traditional castors.

If the Sihoo Doro S300 chair isn’t for you

Sihoo S300 ergonomic office chair review image showing a wonderful and handsome male model sitting in the chair while he plays a game.


The Sihoo S300 chair is like a reliable friend—very supportive. Comfort is where the S300 truly excels. Its ergonomic features, including adjustable height and seat depth, plus the innovative Anti-Gravity Mechanism, provide exceptional support. The mesh and Italian velvet construction offer a luxurious feel while maintaining durability and elasticity.

However, there are a few drawbacks to consider. The armrests, though highly adjustable, lack a locking mechanism, which can result in unintended movement and castors could be better. Nevertheless, the Sihoo S300 remains a top-tier ergonomic chair that lives up to its promise of comfort and versatility. It’s so comfortable that I often prefer sitting in the S300 rather than on the sofa while on my Steam Deck.

If you’re looking to complete your setup, read our guide on the best gaming desk and the best standing desk. We have plenty of suggestions that would go well with the Sihoo Doro S300.