Sihoo M57 vs M59AS: Which Ergonomic Office Chair Should You Choose?

When it comes to ergonomic office chairs, few brands strike the right balance between comfort, durability, and affordability as well as Sihoo. Two of their most popular mesh office chairs—the Sihoo M57 and the Sihoo M59AS—stand out as strong contenders for anyone looking to upgrade their workstation.
Both chairs share a focus on breathable mesh design, adjustable ergonomics, and all-day comfort, but they differ in subtle ways that could make one a better fit for your needs than the other. In this in-depth comparison, we’ll break down everything you need to know about the Sihoo M57 vs M59AS, from design and ergonomics to features, durability, and value for money.
By the end, you’ll know exactly which chair suits your work, study, or gaming setup best.

1. First Impressions: M57 vs M59AS

The Sihoo M57 has long been a fan-favorite for its sleek full mesh design, ergonomic adaptability, and premium build quality. Its aluminum alloy legs and dual-adjustable lumbar support set it apart as a reliable everyday office chair.
On the other hand, the Sihoo M59AS introduces a fresh take with a dual-section backrest, saddle-shaped seat cushion, and integrated coat hanger. It’s designed for users who want not only comfort and breathability but also extra convenience features and a touch of modern styling.
At first glance, both chairs look similar—high-back mesh chairs with adjustable headrests and armrests—but subtle design tweaks make each unique.

2. Breathable Mesh Design

Sihoo M57:

The M57 features a full mesh construction that encourages airflow from top to bottom. Whether you’re working long hours in a home office or gaming during the summer, the breathable mesh prevents heat buildup and helps you stay sweat-free.

Sihoo M59AS:

Similarly, the M59AS is built with a high-quality mesh material that covers the entire chair, from the backrest to the seat cushion. What makes it stand out is the saddle-shaped seat cushion that not only breathes well but also distributes weight evenly across your hips and thighs.
Verdict:
If you’re particularly prone to heat buildup, both chairs deliver excellent cooling. The M59AS wins extra points for pairing breathability with pressure distribution thanks to its seat cushion design.

Side-by-Side Comparison: Sihoo M57 vs M59AS

For a clearer overview, here’s a direct feature-by-feature comparison between the two chairs:

With the main features laid out side by side, it’s easier to see how the M57 leans toward durability and precise adjustments, while the M59AS focuses on adaptability, comfort, and smart conveniences.

3. Backrest and Lumbar Support

Sihoo M57:

• Contoured Backrest: Designed to follow the natural “S” shape of your spine, the M57 provides consistent back support from your shoulders to your lower back.
• Dual-Adjustable Lumbar Support: Unlike many chairs that only allow basic lumbar movement, the M57 offers vertical and horizontal adjustments, letting you fine-tune support to match your posture.

Sihoo M59AS:

• Dual-Section Backrest: This innovative backrest design separates the chair into upper and lower sections, ensuring that your spine is cradled with more precision.
• Dynamic Lumbar Support: Instead of static adjustments, the lumbar area of the M59AS adapts naturally to your movements, offering continuous comfort whether you lean forward, recline, or sit upright.

Verdict:
If you like precise manual control over lumbar positioning, the M57 is better. But if you prefer adaptive support that automatically adjusts to your posture, the M59AS is the winner.

4. Armrests

Sihoo M57:

• 3D Adjustable Armrests: Move up and down, forward and backward, and rotate sideways.
• This flexibility ensures your arms and shoulders stay relaxed whether typing, reading, or gaming.

Sihoo M59AS:

• 3D Flip-Up Armrests: Similar adjustability as the M57 but with an added flip-up feature, allowing you to tuck the chair neatly under your desk when not in use.
• Perfect for compact workspaces where space-saving is a priority.

Verdict:
Both deliver ergonomic adjustability, but the M59AS edges ahead thanks to its flip-up functionality for better versatility.

5. Headrest

Sihoo M57:

• Customizable Headrest: Vertically adjustable up to 3.9 inches and rotatable by 45°.
• Excellent for finding the perfect angle for neck support, whether sitting upright or reclining.

Sihoo M59AS:

• Double-Jointed Headrest: Offers even finer tuning with height adjustment plus rotation for more precise neck alignment.
• Helps reduce tension during long hours of work.

Verdict:
The M59AS offers more nuanced adjustability, but the M57 remains highly effective if you want straightforward head and neck comfort.

6. Seat Comfort

Sihoo M57:

• Mesh seat provides firm support and breathability.
• Good for extended sitting, though users who prefer extra cushioning may find it a bit firm.

Sihoo M59AS:

• Saddle-Shaped Seat Cushion: A standout feature that evenly distributes pressure across the thighs and hips.
• Prevents fatigue and discomfort, especially for people who sit for long, uninterrupted sessions.

Verdict:
If comfort is your top priority, the M59AS takes the lead here with its pressure-relieving cushion design.

7. Recline and Relaxation

Both chairs recline up to 126°, making them equally capable of providing a relaxing break during long workdays.

• M57: Pairs recline with solid back support.
• M59AS: Recline feels slightly more dynamic, thanks to the dual-section backrest and adaptive lumbar support.

Verdict: Tie, though the M59AS feels a little more natural during recline.

8. Ease of Adjustments

Both models make it simple to adjust height, recline, and other features with intuitive controls.

• M57: Adjustment levers are straightforward and durable.
• M59AS: Similar controls, but with slightly smoother movement and added features like flip-up arms.

Verdict: Both excel, but the M59AS offers a slightly more refined experience.

9. Build Quality and Durability

Sihoo M57:

• Reinforced with steel gas lift and aluminum alloy legs, making it exceptionally durable.
• Designed to support users up to 330 lbs.
• Feels solid and premium.

Sihoo M59AS:

• Built with high-quality mesh and durable components.
• While strong, its design emphasizes comfort and flexibility over heavy-duty reinforcement.

Verdict:
The M57 wins in raw durability and heavy-duty construction, while the M59AS balances sturdiness with ergonomic flexibility.

10. Extra Features

Sihoo M57:

• Focused purely on ergonomics and durability.
• Clean, professional design with fewer extra conveniences.

Sihoo M59AS:

• Includes an integrated coat hanger, making it convenient to store jackets or bags.
• Adds thoughtful extras to everyday usability.

Verdict:
If you appreciate smart touches like a coat hanger, the M59AS is more user-friendly.

11. Who Should Buy the Sihoo M57?

The Sihoo M57 is best suited for:

• Professionals who want durability and adjustability above all else.
• Users who prefer precise lumbar adjustments rather than adaptive support.
• Those who need a heavy-duty office chair for long-term reliability.
• People who want a professional, minimalist design without extra frills.

Sihoo M57 Office Chair

The Sihoo M57's full mesh construction ensures superior airflow, keeping you cool and preventing sweat and discomfort even in hot weather.

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12. Who Should Buy the Sihoo M59AS?

The Sihoo M59AS is ideal for:

• Users seeking all-day comfort with adaptive lumbar support.
• People who value extra convenience like flip-up armrests and coat hanger integration.
• Those who prefer a pressure-relieving seat cushion for long sitting sessions.
• Compact home office setups where space-saving armrests are a must.

Sihoo M59AS Ergonomic Office Chair

Its full premium mesh design keeps you cool while the dual-section backrest and flip-up armrests deliver customized support. Perfect for staying comfortable and productive during long, hot workdays.

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13. Price and Value

While exact prices vary depending on region and promotions, the M59AS is often slightly more affordable than the M57. This makes it a great choice for users who want advanced ergonomic features without paying extra for heavy-duty reinforcement.
The M57 may cost a bit more, but its build quality, materials, and long-term durability justify the price for those who prioritize longevity.

14. Final Verdict: Sihoo M57 vs M59AS

Choosing between the Sihoo M57 and M59AS ultimately comes down to your priorities:

• Choose the M57 if you want:
  • Heavy-duty durability
  • Dual-adjustable lumbar support
  • A professional and minimalist design
• Choose the M59AS if you want:
  • Adaptive lumbar support
  • Saddle-shaped seat cushion
  • Flip-up armrests and added conveniences
  • A more budget-friendly option

Both chairs deliver excellent ergonomic support, breathability, and all-day comfort, but they cater to slightly different user needs.
If durability and precision matter most, go with the M57. If comfort, adaptability, and smart features are your focus, the M59AS will serve you better.