SIHOO M18 vs M57: Which Office Chair Should You Choose? (October 2026)

On this page (8 sections)

1. SIHOO M18 vs M57: which chair should you choose?
2. How do the M18 and M57 seats compare?
3. Which chair gives you more adjustment?
4. Is the M18 2-pack a better fit than the M57?
5. Which chair suits your room and routine?
6. What are the trade-offs between these SIHOO chairs?
7. How does the M18 compare with other SIHOO chairs?
8. Final choice: SIHOO M18 or M57?

Choose the SIHOO M18 for its cushioned seat and mesh back, or the M57 for its split back and stated 90° to 126° recline. In this SIHOO M18 vs M57 comparison, seat feel and the adjustments you want matter more than the model name.

Both are ergonomic mesh-back chairs with adjustable support. The M18 adds an upholstered sponge seat, while the M57 gives more detail about recline and the range of its lumbar adjustment.

The M18 choices here include a single chair and a 2-pack. Check which format you need before comparing either one with the M57.

SIHOO M18 vs M57: which chair should you choose?

Choose the M18 if a cushioned seat is your priority; choose the M57 if you want a split back and a defined recline range. Both offer ways to adjust the chair to your posture.

The M18 has an adjustable headrest, back support, seat height, recline and armrest height. Its seat has a W-shaped design and a waterfall front edge.

The M57 has a tilting and lifting headrest, lumbar support that shifts in height and depth, and recline from 90° to 126°. Its armrests are 3D adjustable.

SIHOO M18 vs M57 at a glance

The M18 makes its seat design the clearest point of difference, while the M57 emphasizes back and movement adjustments. Use this quick comparison to decide which details fit the way you sit.

The M18's seat details help if you already know you prefer an upholstered cushion. For a broader look at SIHOO's options, see our best SIHOO ergonomic office chair guide.

How do the M18 and M57 seats compare?

The M18 has the more clearly described cushioned seat. Its high-density sponge cushion has a W-shaped design to help center you, with a waterfall edge intended to reduce pressure on your legs.

The M57's information describes a waterfall-edge seat that supports the thighs, but it doesn't give the same cushion material or seat-shape details. If cushioning is a deciding factor, the M18 gives you more to weigh.

When does the M18's cushion make sense?

Pick the M18 if you prefer an upholstered seat and want its cushion details spelled out. The mesh back also promotes airflow, which may matter if you tend to feel warm while sitting.

The M18's seat edge and W-shaped surface are design features, not a promise that the chair will suit every body. Your comfort also depends on seat height, desk position and how your feet meet the floor.

Read the full SIHOO M18 review for a closer look at its seat and adjustment options. If you're unsure about the fit at your desk, our guide to choosing the right office chair height explains how to check the chair against your work surface.

What does the M57's split back change?

The M57 uses a split backrest shaped to follow the spine's natural curve. Its lumbar support shifts in height and depth, so you can change where it meets your lower back.

That design may appeal if lumbar positioning is a priority. The available details don't specify an upholstered seat cushion for the M57, so don't assume it has the same feel as the M18.

Which chair gives you more adjustment?

The M57 spells out a wider recline range, while the M18 lists 5 adjustment settings. Look at which movements you plan to change during a typical workday.

The M57 reclines from 90° to 126°. Its headrest tilts and lifts, and its lumbar support moves in height and depth.

The M18 adjusts its back support, headrest, seat height, recline and armrest height. The details here don't give a recline angle range, so you can't compare its recline travel with the M57 by degrees.

Are the armrests different?

The M57 has 3D armrests. One M18 option specifies 2D armrests, and the other describes armrests that adjust in height.

If you rest your arms while typing, think about whether height adjustment meets your needs or whether you want more movement. The chair's fit at your desk still depends on the height and width of your work surface.

How should you think about lumbar support?

Both chairs offer adjustable support in the back area. The M18 lists adjustable back support, while the M57 specifies that its lumbar support moves in height and depth.

A bad back can have many causes, and an office chair can't diagnose or treat pain. If you have ongoing discomfort, consider advice from a health professional; for chair features and fit, see our guide on choosing an office chair for a bad back.

Is the M18 2-pack a better fit than the M57?

The M18 2-pack fits a setup that needs 2 matching chairs; the M57 is the straightforward choice when you want one chair with its split-back and recline features. Count the seats you need before comparing the options.

The 2-pack M18 includes adjustable headrest and lumbar support, a mesh back and 2D armrests. It may fit a shared office or two workstations, but it may be more than you need if you're replacing a single chair.

The other M18 option is presented as one chair and has the same cushioned-seat features described above. Compare its exact configuration with the 2-pack before choosing.

Which chair suits your room and routine?

Choose based on how the chair will fit your desk and how you prefer to sit. A chair can have the adjustments you want and still feel wrong if its height or movement doesn't work in your space.

Think about how long you sit at a stretch, whether you recline during breaks and if you prefer an upholstered cushion. Measure your desk height and available floor area, then check the chair dimensions for the exact option you plan to buy.

The two M18 versions have different configurations. The 2-pack option lists different dimensions from the single-chair option, so confirm the item you intend to order rather than treating every M18 listing as identical.

What are the trade-offs between these SIHOO chairs?

The M18 gives you a clearer seat-cushion choice; the M57 gives you more specific recline and lumbar-movement details. Neither is automatically the better fit for every desk or sitter.

Choose the M18 for its upholstered sponge seat, mesh back and five listed adjustment settings. Its 2-pack version can also suit a setup that needs two chairs.

Choose the M57 if its split backrest and 90° to 126° recline range match how you work. Its lumbar support shifts in height and depth, and its armrests are 3D adjustable.

SIHOO states a 3-year warranty and 30-day returns for the chairs described here. Review the terms for the exact option you choose, since configuration and purchase details can matter.

How does the M18 compare with other SIHOO chairs?

The M18 and M57 are two options in a wider SIHOO range, so consider your fit needs before settling on either. A different back design or adjustment setup may suit you better.

If you want a newer model to compare, read our SIHOO Doro C300 Pro review. The SIHOO Doro C300 review is another useful point of comparison when you're considering the brand's other ergonomic chairs.

Final choice: SIHOO M18 or M57?

Pick the M18 if you want a cushioned, upholstered seat; pick the M57 if the split back, adjustable lumbar position and defined recline range matter more. If you need two chairs, the M18 2-pack may fit your setup; for one chair, compare the single M18 and M57 around the adjustments you expect to use.

Comfort depends on your body, desk and posture, so use the stated features as a shortlist rather than a guarantee. Check the exact chair configuration and dimensions before you order.

Our score weighs specs, features and buyer feedback against what you're shopping for.

Frequently asked questions

Is the SIHOO M18 or M57 better for long desk sessions?

The M18 may suit you if you prefer a cushioned seat with a mesh back, while the M57 may suit you if recline and lumbar adjustment matter more. Neither chair is guaranteed to feel comfortable for everyone, so match the design to your preferred seat feel and the adjustments you use.

What is the main difference between the SIHOO M18 and M57?

The M18 pairs a mesh back with an upholstered sponge seat and 5 adjustment settings. The M57 has a split backrest, lumbar support that adjusts in height and depth, 3D armrests and a stated recline range of 90° to 126°.

Does the SIHOO M18 come with a cushioned seat?

Yes. The M18 has an upholstered seat with high-density sponge, a W-shaped design and a waterfall front edge.

Those details may appeal if you want a cushioned seat, while the M57 information here focuses on its split backrest and adjustments.

Which SIHOO chair has more recline detail?

The M57 has a stated recline range of 90° to 126°, which makes its movement easier to compare. The M18 includes recline as one of its adjustment settings, but a matching angle range isn't specified here.

Should you choose the M18 2-pack or the M57?

Choose the M18 2-pack if you need 2 chairs with mesh backs and adjustable headrest and lumbar support. Choose the M57 if one chair with a split backrest, 3D armrests and a stated 90° to 126° recline range fits your setup better.