Sihoo M59AS Review: The Modern Ergonomic Chair That Redefines Everyday Comfort

In the world of ergonomic office chairs, comfort and design precision often come at a steep price. But Sihoo has built a reputation for making high-performance ergonomic chairs accessible to professionals, students, and home office users alike. The Sihoo M59AS, one of the brand’s standout models, continues this legacy — blending engineering innovation, practical features, and modern aesthetics in one remarkably versatile chair.
This review takes a detailed look at the Sihoo M59AS, examining its design, ergonomics, usability, and long-term comfort. Whether you’re upgrading your home office, setting up a professional workspace, or looking for a chair that actually supports your posture, this review will help you decide if the M59AS is the right fit for you.

Overview: Designed for Support, Comfort, and Simplicity

At first glance, the Sihoo M59AS exudes a sense of balance — it’s not overly flashy, yet every component feels purposeful. The design language combines clean lines, lightweight mesh surfaces, and precisely engineered ergonomic elements, resulting in a chair that’s both modern and functional.
Sihoo describes the M59AS as being built for “comfort that moves with you.” That phrase perfectly sums up what the chair offers: a dual-section backrest that adapts to your spine, dynamic lumbar support, and 3D-adjustable flip-up armrests for total flexibility.
It’s a chair designed to follow your posture, not fight it.

Build Quality and Design Aesthetics

The Sihoo M59AS is built around a sturdy metal frame with premium-grade mesh fabric stretched across the seat and backrest. The mesh design isn’t just for looks — it’s engineered to enhance airflow and reduce heat buildup, a crucial factor for anyone who spends long hours seated.
Unlike cheap mesh chairs that sag or tear over time, the M59AS uses high-tension mesh that retains its elasticity while remaining supportive. You can immediately feel the difference when you sit — the mesh cradles you without that “hammock” sinking effect common in lower-end models.
Visually, the M59AS is minimalist but professional. The neutral color palette — black and silver — makes it blend seamlessly into most workspaces, whether you’re furnishing a corporate office or a minimalist home setup. The integrated coat hanger at the back is a subtle yet practical touch, giving the chair a polished, business-ready finish.

Dual-Section Backrest: Intelligent Spinal Alignment

The dual-section backrest is one of the Sihoo M59AS’s most defining features. Unlike traditional one-piece designs, this chair splits the back support into two independent segments — an upper section for the thoracic spine and shoulders, and a lower section that flexes and adapts to the lumbar curve.
This dual design promotes the natural “S” curve of your spine, which is critical for long-term back health. As you move, shift, or recline, the two sections move independently, maintaining contact and support across the entire back.

Benefits of the Dual-Section Design

• Continuous Support: Prevents pressure gaps when you lean forward or backward.
• Posture Adaptability: Adapts to different body shapes and sitting styles.
• Spinal Relief: Keeps the spine properly aligned, reducing fatigue in the lower back and shoulders.

For professionals who spend 8+ hours at a desk, this feature alone makes the M59AS stand out. It’s a thoughtful design that quietly does its job — keeping you comfortable, aligned, and pain-free.

Dynamic Lumbar Support: Personalized Comfort for Every Posture

The dynamic lumbar support system automatically adjusts to your movements, providing consistent lower-back support whether you’re typing, reading, or reclining. You don’t have to constantly tweak the settings — it moves naturally with you.
This is particularly beneficial for people who alternate between upright and relaxed postures. The lumbar pad flexes forward when you sit upright to promote active posture, and gently releases as you recline, preventing pressure buildup on the lower back.

What Makes It Different

• Self-Adaptive Movement: No manual levers — the lumbar zone responds automatically to pressure.
• Balanced Firmness: Not too soft, not too rigid — ideal for extended sitting.
• Long-Term Ergonomics: Encourages healthy spinal curvature without forcing an unnatural posture.

In real use, this translates to a backrest that feels alive — it adjusts, follows, and supports rather than constraining you.

3D Flip-Up Armrests: Support Meets Space Efficiency

The 3D-adjustable flip-up armrests on the Sihoo M59AS are both functional and clever. You can adjust them up and down, forward and backward, and pivot them to match your arm and shoulder angles — an essential feature for typing ergonomics.
But the real magic is the flip-up function. When not in use, you can fold the armrests upward to slide the chair under your desk, freeing up space in compact environments. This makes it a practical option for home offices, shared workspaces, or small rooms.

Why 3D Armrests Matter

• Custom Fit: Supports different body sizes and working postures.
• Reduced Shoulder Tension: Keeps arms at natural angles, preventing strain.
• Space-Saving: Easily tucks under most standard desks.

The armrests are also softly padded and stable — they don’t wobble or feel flimsy, even after repeated adjustments.

Dual-Jointed Headrest: Tailored Neck Support

Neck pain is one of the most overlooked consequences of poor office seating. The Sihoo M59AS addresses this with a dual-jointed headrest that can be adjusted both in height and angle.
This flexibility allows you to position the headrest exactly where your neck needs support, whether you’re tall, short, or somewhere in between. During recline, it continues to cradle your neck, preventing the awkward “head tilt” that causes stiffness over time.

Highlights

• Height Adjustable: Accommodates users of different heights.
• Rotational Angle: Lets you fine-tune the headrest’s tilt for better alignment.
• Stable Construction: Holds its position without slipping or loosening.

It’s a subtle but important feature — one that turns long hours of sitting into genuinely comfortable sessions.

Saddle-Shaped Seat Cushion: Comfort That Lasts

While back support often gets the spotlight, seat design plays an equally critical role in comfort. The M59AS features a saddle-shaped seat cushion designed to distribute body weight evenly and reduce pressure on your hips and thighs.
The shape encourages a more open hip angle, improving blood circulation and minimizing numbness during extended work hours. The waterfall edge — a downward curve at the front of the seat — further alleviates pressure behind the knees.

Seat Design Benefits

• Even Weight Distribution: Reduces fatigue and soreness.
• Breathable Mesh: Keeps the seat cool and dry.
• Long-Session Comfort: Prevents discomfort from static posture.

After several hours of sitting, the difference becomes noticeable — you don’t experience that “sinking fatigue” common with foam-padded seats.

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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Breathable Full Mesh Design: Cool Comfort All Day

The full mesh design of the Sihoo M59AS is more than an aesthetic choice — it’s a performance feature. The high-quality elastic mesh promotes continuous airflow, keeping your back, thighs, and shoulders cool throughout the day.
For users in warmer climates or without air conditioning, this is a lifesaver. The mesh also resists deformation, ensuring that the chair maintains its support and structure over years of use.

Key Takeaways

• Temperature Regulation: Prevents heat and sweat buildup.
• Easy Maintenance: Wipes clean, dries quickly, and doesn’t trap odors.
• Durable Tension: Maintains elasticity even after heavy use.

Simply put, it’s a chair built for real-world comfort — not just short-term aesthetics.

Recline and Relax: The 126° Comfort Zone

The Sihoo M59AS offers a reclining range up to 126°, which makes it ideal for both focused work and short breaks. The recline is smooth, stable, and balanced — it doesn’t tip you backward suddenly like cheaper tilt mechanisms.
The tension control knob lets you adjust the resistance, allowing for either a firmer upright position or a relaxed recline for reading or reflection. Pair this with the supportive headrest and flexible lumbar system, and you have a chair that transitions seamlessly from productivity to relaxation.

Practical Details: Built-In Coat Hanger and Easy Adjustments

The integrated coat hanger on the M59AS might sound minor, but it’s surprisingly useful. Whether it’s a blazer, cardigan, or bag, you can keep essentials within reach and off the floor — maintaining a clean, organized workspace.
Meanwhile, the adjustment levers are intuitive and solidly built. The mechanisms for seat height, tilt, and recline lock feel premium and respond smoothly, reflecting thoughtful engineering.

Durability and Warranty

The M59AS is constructed with high-grade materials that stand up to daily wear. The frame, base, and components are all BIFMA-certified, ensuring they meet rigorous standards for safety and performance.
Backed by a 3-year warranty and a 30-day free return policy, Sihoo offers confidence in its craftsmanship. Shipping is also quick (5–7 days in the US and Canada), and their support team — reachable at support_us@sihoo.com — is responsive and helpful.

Who Is the Sihoo M59AS For?

The Sihoo M59AS fits a wide range of users. Its adaptability, breathable mesh, and dynamic ergonomics make it suitable for:

• Office professionals who sit for extended hours.
• Students who need posture support during study sessions.
• Home office users looking for a balance between style and function.
• Gamers who want a cooler, more supportive alternative to foam-based gaming chairs.
• Designers and creators who appreciate flexibility and precision adjustability.

In short, it’s a chair that adapts to you — not the other way around.

Sihoo M59AS vs. Traditional Office Chairs

The comparison makes it clear: the M59AS provides a more advanced ergonomic experience without crossing into luxury pricing territory.

User Experience: Comfort in Real Use

After several weeks of use, what stands out most about the M59AS is its consistency. Whether you’re sitting for two hours or ten, the chair remains supportive, cool, and stable.
The mesh breathes, the lumbar adjusts, and the saddle seat keeps pressure evenly distributed. Every movement feels natural — a testament to its thoughtful engineering.
Users frequently praise its value-for-money ratio. For a chair that offers features found in much pricier models , the M59AS delivers exceptional comfort and durability at a fraction of the cost.

Verdict: A Smart Investment in Comfort and Health

The Sihoo M59AS strikes the ideal balance between comfort, support, and functionality. Its combination of dual-section backrest, adaptive lumbar, and breathable mesh design makes it one of the most thoughtfully designed chairs in its class.
For anyone seeking a long-term seating solution that prioritizes ergonomics without extravagance, the M59AS is a standout choice. It’s reliable, adjustable, and genuinely supportive — a rare trio in today’s office chair market.
Whether you’re working from home, designing for hours, or gaming through the night, this chair helps you do it all — comfortably and confidently.

FAQs About the Sihoo M59AS

1. Is the Sihoo M59AS suitable for tall users?

Yes. Thanks to the adjustable headrest and tall backrest, the M59AS accommodates users up to around 6'2" (188 cm) comfortably. The seat height range is generous enough for most body types.

2. How does the mesh compare to fabric or leather chairs?

Mesh offers superior breathability and temperature regulation. While it feels firmer than padded seats at first, it provides better long-term support and prevents overheating during extended sessions.

3. Can the armrests be completely removed?

The armrests are designed to flip up for space-saving but are not intended for full removal. This design balances flexibility with structural stability.

4. Does it require assembly?

Yes, but assembly is straightforward. The package includes all tools and instructions, and most users can complete setup in 20–25 minutes.

5. How durable is the chair for long-term use?

With its BIFMA-certified build and premium mesh, the M59AS is designed for multi-year use. Sihoo backs it with a 3-year warranty, ensuring long-term reliability.

6. Is the chair noisy when reclining or adjusting?

No. The mechanisms operate quietly and smoothly, maintaining a professional environment even during frequent adjustments.

7. Is it worth the price?

Absolutely. Considering its ergonomic innovations, build quality, and adjustability, the M59AS offers exceptional value compared to both budget and premium competitors.

Final Thoughts

In an era where we spend more time seated than ever, investing in a chair that supports your health is non-negotiable. The Sihoo M59AS isn’t just a piece of office furniture — it’s a tool for better posture, improved focus, and all-day comfort.
With a sleek design, adjustable ergonomics, and expert-backed construction, it’s a chair that delivers exactly what modern professionals need: comfort that adapts, support that lasts, and design that fits your lifestyle.