Right then, you’ve narrowed it down to two of our very best. You’re at a crossroads, choosing between the Sihoo S100 and the S300. It’s a good problem to have, but a choice nonetheless, and we’re here to make it crystal clear.
At their core, both ergonomic chairs are designed for exceptional all-day comfort, but they have two very different ways of going about it. Right then, before we get down to the nuts and bolts, let’s compare them head-to-head and get straight to the point.
Full Specification Comparison
| Feature | Sihoo S100 | Sihoo S300 |
|---|---|---|
| Price | £229.99 | £599.99 |
| Core Concept | Dynamic Floating Support | Zero-Gravity Suspension |
| Lumbar Support | A dynamic system designed to actively flex, massage, and cradle the lower back. | An enhanced, larger version with both auto-adapting and manual controls for a tailored fit. |
| Chassis & Recline | Smart Chassis with automatic tension adjustment based on your weight. | Advanced 'Space' Chassis using responsive fibreglass leaf springs for an ultra-smooth recline. |
| Frame & Spine | Durable and flexible Nylon frame. | Polished, single-piece aluminium alloy frame. |
| Armrests | 4D armrests that move with you as you recline. | 6D 'Bionic' armrests offering maximum adjustability. |
| Seat Cushion | Wide, pressure-relieving seat with depth adjustment. | A cushion with a built-in spring suspension system to absorb movement. |
| Seat Depth Adjust | 5 cm | 7 cm |
| Upholstery | Breathable, high-tensile mesh. | Plush 'Cloud' fabric, blending Italian velvet and technical fibres. |
| Controls | Simple, single-lever control. | Sleek, integrated fingertip controls. |
| Recline Range | 100° - 135° | 100° - 145° |
| Recommended Height | 150 - 190 cm (Approx. 4'11" - 6'3") | 150 - 190 cm (Approx. 4'11" - 6'3") |
| Gas Lift | Class 4 (Top safety standard) | Class 4 (Top safety standard) |
| Base | Heavy-duty steel five-star base. | Polished aluminium five-star base. |
Core Design and Technology
As the table shows, the price difference reflects two distinct approaches to ergonomics. It’s not just about better materials; it’s about a different philosophy of support.
The S100 is engineered around Dynamic Floating Support. Think of its unique lumbar system as an active partner for your back. It’s not a static cushion, but a responsive mechanism designed to gently flex, massage, and cradle your lower back as you move. If you’re looking for a chair that provides tangible, active relief throughout the workday, this is the philosophy for you.
By contrast, the S300 is built to deliver a feeling of Zero-Gravity Suspension. Every component, particularly its advanced 'Space Chassis', works to create a sensation of near-weightlessness. The recline is utterly seamless, designed to make you feel effortlessly supported, rather than actively massaged. This is the choice for those who want the chair to almost disappear beneath them, providing a flawless, top-tier glide into comfort.
Sihoo Doro S300 Ergonomic Office Chair
Where cutting-edge ergonomics meet futuristic design. The ultimate chair for long hours of healthy, productive work.
Lumbar Support System
A great ergonomic chair is often defined by how well it treats your lower back. While both the S100 and S300 use our 'Floating Wing' technology, they apply it differently to achieve their distinct comfort goals.
The S100’s system is brilliantly clever. It’s not a simple cushion but a dynamic mechanism. The design philosophy here isn't to just push aggressively into your back; it's to gently lift and cradle your lumbar muscles from either side. This is what creates that unique kneading and massage-like sensation. It's an active system that constantly works to disperse pressure as you shift throughout your day.
The S300 takes this same core concept and enhances it significantly. Its 'Floating Wing' plates are much larger, providing a broader area of contact that envelops the entire lower back. This comprehensive coverage reduces pressure on any single point by a remarkable 24%. The key upgrade, however, is control. Alongside the automatic, adaptive movement, the S300 adds a manual adjustment, allowing you to dial in the precise position and intensity for a truly bespoke fit.
Sihoo S100 Ergonomic Office Chair
Your reliable ergonomic companion for the daily grind. The perfect balance of comfort, stability, and adjustability.
Chassis and Recline Mechanism
The way a chair reclines is just as important as how it supports you when you’re sitting upright. This all comes down to the chassis—the engine of the chair—and it’s another area where the S100 and S300 take different engineering routes.
The S100 is equipped with our Smart Gravity-Sensing Chassis. It cleverly senses your body weight and automatically adjusts the recline tension to match.
This means you get the right amount of support when you lean back, regardless of your build, without ever touching a tension knob. It’s designed to make reclining feel consistently easy and natural.
The S300, however, introduces our next-generation 'Space Chassis', and this is a genuine game-changer. Instead of a standard spring, it uses two responsive, aerospace-grade fibreglass leaf springs, much like the suspension in a high-performance car.
This is paired with a sophisticated linkage that allows the seat base to glide forward as you recline. This coordinated movement keeps you perfectly balanced and prevents that awkward feeling of your shirt riding up. The result is a phenomenally smooth, almost weightless glide that is leagues ahead in refinement.
Frame Construction and Durability
A chair's frame, or spine, is its foundation. It dictates not only long-term durability but also the chair's overall aesthetic and feeling of stability.
The S100 uses a spine crafted from a high-performance engineered nylon. This material is chosen for its remarkable combination of strength and flexibility, allowing the backrest to have a slight give.
It's built to withstand years of daily use, having passed a punishing 120,000-cycle durability test, ensuring a supportive yet resilient feel.
The S300 makes a significant leap in materials, featuring a spine crafted from a single piece of die-cast aluminium alloy. This is meticulously polished through thirteen different stages to achieve a flawless, high-grade finish.
This provides a noticeable increase in rigidity and stability, giving the chair a more solid, premium feel. While it passes the same tough durability tests, the polished aluminium offers a more commanding presence and a distinctly high-end look.
Ergonomic Feature Details
True ergonomic comfort is found in how all the components work together. Here’s how the S100 and S300 compare in the crucial finishing touches that refine your sitting experience.
4D vs 6D Armrests
The S100 comes with highly capable 4D armrests. This means you can adjust them up and down, forwards and backwards, and pivot them inwards or outwards to find your ideal position.
Crucially, they also link with the recline mechanism. This 'Autofollow' feature ensures your arms remain comfortably supported at a consistent height, even when you lean back.
The S300 elevates this with its 6D 'Bionic' armrests, designed to offer an unparalleled range of motion. They provide all the same adjustments as the S100, but with two extra, game-changing dimensions of control.
You gain the ability to slide the armrests further in or out laterally, letting you set the perfect width for your shoulders. They also feature an independent upward tilt, which is ideal for supporting your forearms when using a phone, tablet, or handheld console.
Seat Cushion Technology
The S100 features a wide, pressure-relieving seat cushion designed for long-term comfort. Its generous padding provides excellent shock absorption and even weight distribution to prevent fatigue.
The seat base also slides forwards and backwards, offering 5 cm of depth adjustment. This allows you to set the perfect distance between the back of your knees and the edge of the chair.
The seat of the S300 takes a cue from the automotive world, integrating a genuine spring suspension system. This allows the cushion to actively absorb and buffer impacts when you sit down or shift your weight.
This creates a noticeably more dynamic and responsive feel during active sitting. It also offers a greater range of seat depth adjustment, with 7 cm of travel to precisely fine-tune your fit.
Upholstery Materials and Feel
The S100 is upholstered in our durable High-Elastic Wave Mesh. This specially woven material is designed to be both highly breathable and supportive.
It provides a firm, responsive feel that holds its shape, while allowing excellent air circulation to keep you comfortable during long sessions.
The S300 features our exclusive 'Cloud Fabric', a significant upgrade in textile technology. It’s a sophisticated blend of soft, imported Italian velvet and resilient DuPont technical fibres.
This results in a material that feels incredibly soft and plush to the touch, almost like a high-end sofa. It offers a more luxurious and encompassing sitting experience than traditional mesh.
Control Systems
The S100 is designed for straightforward, intuitive adjustment. It uses a simple and robust single-lever system for its main controls.
This makes adjusting your seat height or locking the recline quick and easy to do, with a tactile and reliable feel.
The S300 streamlines this process further with a highly integrated control system. All of the chair's core functions are managed from a single, elegant hub at your fingertips.
This means you don’t have to reach for different levers, as everything is in one place. It’s a cleaner, more modern approach that makes fine-tuning your chair feel seamless.
Which Chair Should You Choose?
Choosing between these two chairs isn't about which is "better," but which is better suited to your specific needs, priorities, and budget.
You should choose the S100 if...
You are looking for a massive upgrade from a basic office or gaming chair to a truly high-performance ergonomic model. Its value is exceptional.
Your main priority is active, dynamic support for your lower back. If the idea of a gentle, massage-like system that works as you move appeals to you, the S100 is purpose-built for that.
You appreciate smart, effective engineering that delivers tangible benefits without needing to be the absolute top-of-the-line model.
You should choose the S300 if...
You are a power user who spends many hours a day seated and views your chair as a critical long-term investment in your health and comfort.
You prioritise a sensation of supreme, weightless smoothness in your recline over an active massage feel. You want the mechanism to feel utterly seamless.
You demand the finest materials, a premium finish, and the maximum possible range of adjustment to dial in a perfectly bespoke fit.
Final Thoughts
Ultimately, whether you choose the dynamic support of the S100 or the suspended luxury of the S300, you're making a significant investment in your daily well-being. Both chairs are built with our unwavering commitment to ergonomic excellence and long-lasting quality. We hope this guide has made your choice clearer and invite you to explore the full details on our website.
FAQs
What is the biggest difference between the S100 and S300?
The S100 offers an active, massage-like lumbar support, while the S300 provides an ultra-smooth, zero-gravity recline with more premium materials and adjustments.
I sit for over 8 hours a day. Which chair is better?
For extensive daily use, the S300 is the recommended investment due to its superior suspension, materials, and wider range of fine-tuning adjustments.
Is the S300 worth the extra cost over the S100?
If you value the smoothest recline, luxury materials, and maximum adjustability, the S300's advanced engineering justifies the higher price point.
