Sihoo M59AS vs Sihoo Doro S100: Which Ergonomic Chair Should You Choose?

In the world of ergonomic seating, Sihoo has established itself as one of the most trusted names among professionals, gamers, and creatives seeking all-day comfort and healthy posture. From its award-winning Doro Series to the versatile M Series, Sihoo continues to redefine what it means to sit in comfort.
Two of its most discussed models — the Sihoo M59AS and the Sihoo Doro S100 — both promise exceptional ergonomic performance, breathable materials, and precise adjustability. Yet, they target slightly different users and scenarios.
If you’re wondering which chair better suits your needs — whether for work, gaming, or home use — this in-depth comparison will help you decide. We’ll evaluate both models based on design, comfort, adjustability, support mechanisms, and long-term usability, providing a clear picture of their strengths and ideal users.

Design and Build Quality

Sihoo M59AS: Functional Elegance

The Sihoo M59AS is designed with versatility and everyday practicality in mind. It’s not flashy — instead, it leans toward streamlined professionalism. The full premium mesh construction creates a breathable, light appearance while maintaining high durability. Every component — from the double-jointed headrest to the dual-section backrest — is crafted for performance and longevity.
One of its unique touches is the integrated coat hanger, a thoughtful convenience that suits office workers who want to keep their jackets wrinkle-free and within reach. The frame feels sturdy yet unobtrusive, supporting up to 300 lbs, and the chair’s motion and mechanisms remain smooth and quiet even after prolonged use.

Sihoo M59AS Office Chair

The Sihoo M59AS combines a breathable mesh design with ergonomic features, ensuring comfort and support all day long.

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Sihoo Doro S100: Sophisticated Ergonomics with Modern Refinement

By contrast, the Sihoo Doro S100 carries a slightly more premium and futuristic look, consistent with the Doro Series design language. The dual dynamic lumbar structure stands out visually — two independent lumbar wings that move with your back to provide continuous support.
The build quality feels elevated: robust metal components, smooth adjustment mechanisms, and mesh materials that balance firmness with flexibility. With endorsements from Gamerant, GeekDad, Gamezebo, Designboom, and hundreds of reviewers, the Doro S100 clearly positions itself as a professional-grade ergonomic chair.

Sihoo Doro S100 Office Chair

The Sihoo Doro S100 features premium elastic mesh for breathable comfort, lasting support, and healthy posture during long hours of sitting.

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Verdict:

Both chairs are built to last, but the Doro S100 has a slight edge in premium construction and visual refinement. The M59AS, however, stands out for its practical, everyday-focused design and slightly lighter frame.

Ergonomic Structure and Back Support

Sihoo M59AS: Dual-Section Backrest for Tailored Support

The M59AS features a dual-section backrest, designed to mimic the natural curvature of the human spine. This helps maintain the S-shaped posture that reduces back strain during long hours of sitting. The dynamic lumbar support automatically adjusts to your movements, ensuring consistent lower back contact and reducing pressure points.
This dynamic system is particularly beneficial for users who frequently shift positions — it “follows” your back without needing manual recalibration.

Sihoo Doro S100: Dual Dynamic Lumbar for Continuous Comfort

The Doro S100 takes lumbar support even further with its dual dynamic lumbar system. Unlike single-panel supports, this dual structure adapts independently to both sides of your lower back, accommodating asymmetrical postures or subtle shifts in seating.
It’s more responsive and gives a spring-like cushioning that continuously aligns your spine, whether you’re leaning forward, upright, or reclining up to 135°. This makes it particularly effective for people who experience chronic lumbar fatigue or stiffness.

Verdict:

The Doro S100 delivers a more advanced lumbar system with its independent dual-dynamic design, ideal for users needing strong, adaptive support. The M59AS, however, still provides excellent ergonomic performance for general office comfort and posture correction.

Seat Comfort and Cushion Design

Sihoo M59AS: Saddle-Shaped Seat Cushion

The M59AS adopts a saddle-shaped seat cushion, carefully contoured to distribute pressure evenly across the hips and thighs. This design prevents numbness and fatigue — a common issue for those sitting for extended hours. The full mesh seat also promotes excellent airflow, keeping you cool during intensive work sessions.
The seat height and recline can be adjusted easily, and the cushioning strikes a balance between firmness and flexibility — perfect for maintaining posture without feeling stiff.

Sihoo Doro S100: Pressure-Free Waterfall Seat

The Doro S100 uses a waterfall-shaped seat edge — a proven ergonomic feature that reduces thigh pressure and improves blood circulation. The seat depth is adjustable, which makes it a better fit for users of different heights and leg lengths. This level of customization allows users to find the perfect ergonomic alignment between seat edge and knee joint.
The mesh fabric used here is denser and slightly more elastic than that of the M59AS, offering both durability and comfort for longer use periods.

Verdict:

While both deliver great comfort, the Doro S100’s seat depth adjustment and pressure-free waterfall edge make it superior for tailored comfort. The M59AS, however, remains excellent for users who prefer a firm, supportive base with strong ventilation.

Headrest and Neck Support

Sihoo M59AS: Dual-Jointed Precisionx

The M59AS features a double-jointed headrest — adjustable in both height and angle. This flexibility allows it to follow your neck movements precisely, whether you’re working upright or leaning back. It’s particularly useful for preventing neck stiffness during long periods of desk work.

Sihoo Doro S100: Multi-Adjustable Headrest for Personalized Alignment

The Doro S100 takes neck comfort up a notch with a multi-adjustable headrest that’s broader, more cushioned, and smoothly adjustable. You can fine-tune both height and tilt, allowing full alignment with the cervical spine.
In addition, when reclining, the headrest naturally follows your motion, maintaining continuous contact with the back of your head — a subtle but highly effective ergonomic touch.

Verdict:

The Doro S100’s headrest provides a more premium, adaptive experience. The M59AS’s double-jointed design, however, is impressively functional and space-efficient — great for minimalist setups.

Armrests: 3D vs 4D Adjustability

Sihoo M59AS: 3D Adjustable Flip-Up Armrests

The 3D adjustable armrests can move up and down, forward and backward, and rotate inward/outward, offering enough flexibility for most users. A key advantage here is the flip-up function, which lets you tuck the chair under your desk — perfect for compact workspaces.

Sihoo Doro S100: 4D Armrests for Full Customization

The Doro S100 introduces 4D adjustable armrests, adding side-to-side movement to the mix. This extra axis gives you finer control over arm positioning, improving wrist and shoulder ergonomics, especially during typing, designing, or gaming.
The surface material is soft yet firm, giving a stable rest platform without feeling rigid.

Verdict:

If your priority is space efficiency, the M59AS flip-up armrests are more practical. But for precision ergonomic alignment, particularly for professionals who spend hours at a desk, the Doro S100’s 4D armrests are unmatched.

Recline and Relaxation

Sihoo M59AS: Up to 126° Reclinex

The M59AS offers a 126° recline angle, enabling a smooth, controlled lean for relaxation between tasks. The recline tension is easy to adjust, letting users personalize the resistance to suit their weight and preference. It’s great for short breaks without leaving your workstation.

Sihoo Doro S100: Enhanced 135° Recline with Adaptive Lumbar Movement

The Doro S100 pushes the recline limit to 135°, allowing a deeper, more luxurious tilt. What sets it apart is that the lumbar support moves dynamically as you recline, maintaining steady contact with your lower back. This ensures your spine remains supported even in relaxed positions — something few chairs achieve effectively.

Verdict:

For all-day office use, the M59AS recline is sufficient and smooth. However, for users who enjoy reclining frequently or using the chair for relaxation, the Doro S100’s deeper recline and lumbar adaptability offer superior comfort.

Breathability and Cooling

Both chairs utilize high-quality breathable mesh, which is essential for preventing heat buildup during long sitting sessions.

• Sihoo M59AS: Uses a full mesh design — back, seat, and headrest — making it extremely airy and easy to clean. It’s an ideal choice for warm climates or users who naturally run hot.
• Sihoo Doro S100: Uses a premium elastic mesh with higher tension and durability. It provides more supportive feedback and is less prone to sagging over time.

Verdict:

The M59AS offers better airflow overall, while the Doro S100’s denser mesh adds firmness and longevity.

Adjustability and Controls

Both models feature intuitive controls for seat height, recline tension, and lock mechanisms.

• The M59AS is designed for effortless everyday use, allowing users to modify settings quickly with minimal mechanical resistance.
• The Doro S100, meanwhile, provides finer granularity in adjustments — seat depth, headrest angle, armrest width, and lumbar responsiveness — giving more room for customization.

Verdict:

If you like simplicity and fast setup, go with M59AS. If you value detailed, precise control, Doro S100 is your match.

Ideal Users and Use Cases

Sihoo M59AS – Best For:

• Office workers seeking all-day comfort with excellent ventilation
• Students or home users in smaller spaces (thanks to flip-up arms)
• Professionals who prefer simplicity and affordability
• Users in warmer climates or shared workspaces

Sihoo Doro S100 – Best For:

• Professionals working long hours who need continuous lumbar support
• Gamers or designers who recline frequently
• Taller users or those needing seat depth adjustments
• Buyers seeking premium ergonomics and certified quality

Summary Table: Sihoo M59AS vs Doro S100

Final Verdict: Which One Should You Buy?

Both the Sihoo M59AS and Sihoo Doro S100 represent Sihoo’s deep understanding of ergonomic design — balancing comfort, adjustability, and durability.

• Choose the Sihoo M59AS if you want a breathable, practical, and affordable chair that performs reliably across work and study environments. Its dual backrest, 3D armrests, and flip-up design make it perfect for smaller offices or minimalist setups.
• Choose the Sihoo Doro S100 if you prioritize advanced lumbar dynamics, precision adjustability, and premium build quality. Its 4D armrests, seat depth control, and dual dynamic lumbar support justify its position as a higher-end model suited for professionals and ergonomic enthusiasts.

In short:

• For value and simplicity → Sihoo M59AS
• For premium ergonomic depth → Sihoo Doro S100

FAQs About Sihoo M59AS and Sihoo Doro S100

Q1: Which chair offers better lumbar support?
The Doro S100 offers superior lumbar support with its dual dynamic system that adapts independently to your lower back movements.
Q2: Is the Sihoo M59AS suitable for gaming?
Yes. Its breathable mesh and recline function up to 126° make it comfortable for gaming sessions, though the Doro S100 provides more lumbar flexibility.
Q3: Can both chairs handle heavy users?
Absolutely. Both support up to 300 lbs, thanks to their reinforced frames and durable construction.
Q4: Which is more suitable for hot climates?
The Sihoo M59AS, with its full mesh design, offers better ventilation and cooling comfort.
Q5: Are the chairs difficult to assemble?
No. Both models come with clear instructions and can be assembled within 20–40 minutes using basic tools included in the package.
Q6: How long can I sit comfortably in each chair?
The M59AS provides solid support for 6–8 hours daily, while the Doro S100 can easily support 8+ hours thanks to its advanced adjustability and seat depth control.

Conclusion

The choice between the Sihoo M59AS and Sihoo Doro S100 ultimately depends on your priorities. The M59AS delivers outstanding comfort, cooling, and practicality at a more accessible price point — ideal for everyday users and compact workspaces. The Doro S100, on the other hand, represents Sihoo’s refined ergonomic innovation, offering deeper customization, adaptive lumbar technology, and certified build quality.
Whether you’re creating a professional workstation or an ergonomic gaming setup, both models ensure that every hour spent sitting is supported by thoughtful, science-backed design.
With Sihoo, you’re not just buying a office chair — you’re investing in your health, focus, and long-term comfort.