Sihoo M56B Dual-Back Ergonomic Office Chair for Better Posture
Benefits
Benefits
- Supports up to 300 lbs
- Over 20" wide dynamic lumbar support for full lower back comfort
- Designed to fit users from 5' to 6'3"
- Breathable saddle-shaped mesh seat with front-edge padding
- 3D adjustable headrest for personalized neck support
- 3D adjustable armrests with soft, wide PU pads
- Smooth recline function for workday breaks
- Certified by BIFMA and SGS for long-lasting performance
Promises
Promises
- 30-Day Free Returns.: Try the chair for 30 days. If it’s not for you, feel free to return it.
- 3-Year Warranty: Enjoy lasting comfort and peace of mind with our 3-year warranty.
- Fast Shipping: Receive your chair in just 5-7 days, in US and CA.
- Satisfaction Guarantee: For any issues, contact support_us@sihoo.com for prompt assistance and guaranteed satisfaction.
Payment methods
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How to choose a right ergonomic office chair?
Check out our buying guide for you!
Supports Up to 300 lbs: Built with durability and strength, the M56B accommodates users up to 300 lbs without compromising comfort or stability.
20.3" Dynamic Lumbar System: The ultra-wide dynamic lumbar system offers full lower back support, flexing and adapting to your body’s movements for personalized comfort all day long.
Designed for Users 5' to 6'3": The M56B is engineered to fit a wide range of body types, ensuring that everyone can find a comfortable and supportive seating position.
Breathable Saddle-Shaped Mesh Seat: The M56B features a breathable, saddle-shaped mesh cushion designed to evenly distribute your weight, preventing pressure points and maximizing comfort during long sitting sessions.
3D Adjustable Headrest: Offering complete neck support, the headrest adjusts in multiple directions (up/down and pivoting) to fit your height and posture, alleviating neck strain during extended desk work.
Roomy 3D Adjustable Armrests: The soft, wide PU armrests adjust in three dimensions (up/down, forward/back, and side-to-side) to offer customized support, helping reduce shoulder and wrist fatigue.
Smooth Recline Function: Featuring a reclining lock with two positions, the M56B allows you to tilt back up to 122°, offering comfort for quick breaks or relaxed work moments.
BIFMA & SGS Certified: Built to last, the M56B meets the highest standards for quality and durability, ensuring long-lasting performance and safety.
High-Quality Materials: The M56B is constructed with breathable mesh, high-resilience padding, and reinforced steel and nylon parts for a combination of comfort and durability.
Easy Assembly: The M56B is easy to assemble, with all parts and instructions included, so you can get back to working in comfort quickly.
What sets the M56B apart from other ergonomic chairs?
The M56B features a dynamic 20.3" lumbar support system that adapts to your body’s movements, offering continuous lower back support. It also includes a fully adjustable 3D headrest and armrests, providing custom support for your neck, arms, and shoulders throughout the day.
How does the lumbar support in the M56B work?
The M56B’s dynamic lumbar system is designed to flex and adapt to your body’s movements. The wide and springy support ensures your lower back is properly supported, reducing strain whether you're leaning forward or reclining.
Can the M56B accommodate taller or shorter users?
Yes, the M56B is designed to fit users ranging from 5' to 6'3", ensuring a personalized fit for various body types. The chair's adjustable components—like the seat depth, headrest, and armrests—ensure everyone can enjoy optimal comfort.
What benefits does the 3D adjustable headrest offer?
The M56B’s 3D adjustable headrest can be adjusted up/down, and pivoted to fit your specific neck support needs. This helps alleviate neck strain, especially during long periods of sitting, meetings, or video calls.
How do the armrests on the M56B improve comfort?
The M56B features roomy, 3D adjustable armrests with soft-touch PU pads. They adjust up/down, forward/back, and side-to-side, ensuring personalized support and reducing shoulder and wrist strain, no matter your sitting posture.
Is the M56B easy to assemble?
Yes, the M56B comes with clear instructions and all the necessary parts for easy assembly. You can have your chair set up in no time, ready to provide ergonomic support for your workspace.
What is the weight capacity of the M56B?
The M56B is built to support users up to 300 lbs, ensuring it’s a durable and sturdy option for a wide range of individuals.
Is the M56B chair suitable for long hours of sitting?
Absolutely. The M56B’s breathable mesh seat, dynamic lumbar support, and adjustable features are designed to provide lasting comfort, even during extended sitting sessions, helping reduce discomfort and fatigue.
Sitting long hours at work shouldn't lead to aches and pains. If your back feels stiff by 3 PM and your shoulders tense up after long Zoom calls, you're not alone. The Sihoo M56B is built to support professionals like you—so you can focus more on work, and less on discomfort.
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Extra-Wide 3D Headrest
Working long hours often leads to neck strain, especially during video calls or deep-focus sessions. The M56B's extra-wide headrest is shaped to support your neck naturally and gives you space to rest your head sideways when you need a break. It adjusts up, down, and pivots in two directions, so you can set it just right for your height and posture—no more awkward angles or sore necks by the end of the day.
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Pressure-Minimizing Comfort Seat
Office chairs shouldn't leave you sore after a long day. The M56B’s saddle-shaped seat cushion is made from breathable mesh and designed to spread your weight evenly—no pressure points, just lasting comfort. With extra foam padding at the front edge, it helps ease leg fatigue and keeps you feeling supported, whether you're typing away or leaning in during a meeting.
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Adaptive Lower Back Support
No two office workers sit the same—and you shouldn't have to. The M56B’s wing-style lumbar system flexes and adjusts to your lower back, no matter your body shape or how you sit. It keeps your spine supported and your posture in check all day, so you can focus on your work—not your discomfort.
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Dynamic 20.3" Lumbar System
Built for serious support, the M56B’s 20.3-inch dynamic lumbar system gives your lower back the care it deserves. It’s wide, springy, and breathable, adapting to the way you move without ever losing its shape.
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Wide-Range Lumbar Comfort
No matter how long you're at your desk—leaning forward in focus or reclining for a quick reset—this lumbar system delivers consistent, custom-fitting support that helps reduce strain and boost your comfort all day long.
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Roomy 3D Arm Support
Your arms deserve better than stiff, narrow armrests—especially during long hours at your desk. The M56B features wide, soft-touch PU arm pads that feel good from the first minute to the last. They're fully 3D adjustable—up/down, forward/back, and in/out—so you can dial in just the right support whether you're typing, meeting, or taking a quick break.
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Shoulder Relief, All Day Long
Tight shoulders after a long day at your desk? The M56B’s generously sized armrests are here to help. With soft-touch padding and full 3D adjustability—up/down, forward/back, and in/out—they let you rest your arms at just the right height and angle. That means less strain on your shoulders and neck, and more comfort whether you're typing, clicking, or just taking a breather.
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Chair back lifting height: 43.5" - 51.8"
Seat depth: 18.1"
Max hip width: 20.1"
Maximum load: 330 lbs
Armrests rotate: 360°
Reclining lock with 2 positions, allowing a maximum tilt angle of 122°.
Armrests: 3D coordinated armrests (Up and down, left, right, side by side)
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Certified by BIFMA and SGS for long-lasting performance.
