If you spend a good part of your day sitting at a desk, you’re probably already aware that not all chairs are created equal. Some leave you shifting in discomfort after just an hour, while others quietly support your back and body through even the longest workdays.
The Sihoo Doro C300 and S100 both aim to do the latter—but they go about it in different ways. In this article, we’ll break down what sets them apart so you can choose the one that truly fits your daily routine and body shape.
Though they’re priced the same, the C300 and S100 cater to slightly different needs. The C300 is focused on dynamic support and flexibility, while the S100 brings extra space and firmness, making it ideal for users who prefer a more structured feel.
Understanding these differences will help you avoid buying something that doesn’t quite suit your working style or body.
Side-by-Side: Key Features Compared
| Feature | Sihoo Doro C300 | Sihoo Doro S100 |
|---|---|---|
| Price | £239.99 | £239.99 |
| Lumbar Support | Self-adaptive lumbar system that adjusts automatically to movement | Dual dynamic lumbar support with spring resistance and broader contact area |
| Backrest | Flexible triangular frame that moves with your upper body | Independent backrest that supports the full spine, including a 135° recline angle |
| Seat Design | Standard waterfall seat with light suspension for reduced thigh pressure | Enlarged waterfall seat designed for broader users, providing better thigh and hip support |
| Seat Dimensions | Depth: 42cm, Max hip width: 51cm | Depth: 42cm, Max hip width: 51cm |
| Weight Capacity | Up to 136kg (300lb) | Up to 136kg (300lb) |
| Recline Mechanism | Smart weight-sensing mechanism, no manual adjustment needed | Manual tilt with up to 135° recline and stable locking positions |
| Armrests | 4D adjustable (height, depth, width, angle) with soft PU coating | 4D adjustable (same spec) with soft PU coating |
| Headrest | Multi-adjustable (height, tilt, depth), auto-lock mechanism | Large fixed headrest, gently curved for relaxed neck support |
| Material | Premium breathable mesh for seat and back, PU armrests | Elastic breathable mesh for seat and back, PU armrests |
| Frame Build | Lightweight ergonomic frame with dynamic flexibility | Bulkier, more structured frame for stability |
| Ideal User Profile | Users who prefer ergonomic precision and lighter support | Users who need firm lumbar support and more seat room |
| Best For | Precision support and flexibility | Roomy comfort and back firmness |
Both models are ergonomic mesh chairs with 4D armrests, breathable materials, and solid build quality. But it’s how they deliver comfort that makes the real difference.
Build Quality and First Impressions
Both chairs arrive well-packaged and include clear assembly instructions. Once set up, it’s obvious they’ve been thoughtfully designed.
The mesh is breathable and slightly springy, ideal for long sitting sessions without trapping heat. Each chair frame feels robust and well-balanced, rated to support users up to 136kg.
The C300 sports a more refined, streamlined look. Its triangular backrest is flexible and moves with your upper body. The S100, by contrast, has a chunkier design with a wider seat and an independent backrest. Some users may find it more reassuring, especially if they prefer structured support.
Back Support: Adapting vs. Anchored
The C300 features an adaptive lumbar support system that responds to your movements throughout the day. This is the ideal chair for those who frequently change posture or prefer precise, continuous support without the need for effortful adjustments.
The S100 features dual dynamic lumbar zones supported by springs. It offers a larger contact area and firmer resistance, making it ideal for users who need more stability in the lower back.
Reclining and Posture Adjustment
The C300 reclines with a smart weight-sensing mechanism. It adapts smoothly without needing to adjust any knobs, giving a balanced and natural lean.
The S100 has a manual recline that goes up to 135°, offering firm resistance and set positions—useful for relaxing or reading. While less adaptive, it provides a more fixed feel some users prefer.
Seat Size and Comfort
Both chairs include a waterfall-edge cushion that reduces thigh pressure. The C300’s cushion includes light suspension for a more buoyant feel. The S100 offers a broader and thicker seat, better suited for larger body types or users who enjoy more surface area.
This might seem like a small detail, but it can make a huge difference in daily comfort—especially if you’re seated for extended hours.
Headrest and Arm Support
The 4D armrests on both chairs are fully adjustable, letting you customise height, depth, angle, and width. This helps relieve tension on your wrists and shoulders, no matter your setup.
The C300 includes a multi-adjustable headrest with a locking mechanism for fine-tuning. The S100 features a larger, cushioned headrest that prioritises simplicity and comfort.
Assembly Experience
Setting up either chair is straightforward. The C300 requires a bit more care aligning the backrest, while the S100 is slightly more intuitive to put together. Expect to spend 30–45 minutes assembling, with all tools provided in the box.
What Real Users Are Saying
Avoid These Common Mistakes
Don’t choose based on looks alone. These chairs might seem similar in photos, but their feel is very different.
Also, consider your body type—if you’re taller or broader, the S100 may feel more natural. And if you sit for long hours, lumbar support is not just a bonus—it’s essential.
Choose the C300 If:
- You want a chair that adapts automatically to your posture
- You prefer a clean, ergonomic design
- You value a fluid recline and responsive support
Choose the S100 If:
- You need a larger seat and firmer back support
- You like a defined recline angle
- You prefer a chair that feels solid and anchored
Final Thoughts
Both the C300 and S100 are strong ergonomic options. The better one for you depends on how you sit, how often you move, and what type of support feels most comfortable.
Either way, you’re making a smart investment in your daily comfort and long-term posture.