Did you physically test the SIHOO M18?

No. This review is a cross-analysis: public spec sheets, tests by fellow specialist sites (chaises-ergonomiques.fr, passionteletravail.fr — see Sources), and verified user feedback. In line with our transparency rule, only products we physically received are presented as 'tested'.

Is the SIHOO M18 really ergonomic at this price?

Yes, on the essentials: height-adjustable lumbar support, adjustable seat height, recline and breathable mesh. What it lacks — 3D armrests, lumbar depth adjustment, seat depth adjustment — usually costs $250-400. For 4-6 hours of sitting per day, it does the job.

SIHOO M18 or SIHOO M57: which one?

The M18 is the mesh entry-level (~$150-180): height-adjustable lumbar, basic armrests. The M57 (~$250-280) adds 3D armrests and slightly better finishes. Minimal budget and heat (full mesh): M18. 6-8 h/day use with fine arm adjustments: M57.

Is the SIHOO M18 suitable for 8 hours of work per day?

It's comfortable for 4-6 h/day according to user feedback. Beyond that, the lack of lumbar depth adjustment and 3D armrests becomes noticeable: for intensive use, move up a range (SIHOO Doro C300, Steelcase Series 1) or see our best ergonomic chairs 2026 comparison.

How long does a SIHOO M18 last?

Expect 2 to 4 years of intensive daily use: entry-level foam and mesh compress over time. The class-4 gas lift and 150 kg structure, however, are built to last. Reviews at 6-12 months are the best barometer — the M18 holds up well for its price.

What warranty does the SIHOO M18 have?

SIHOO generally warranties its chairs for 3 years (like the M57 in our catalogue). Check the exact terms on the product listing at purchase time, as coverage can vary by seller.

SIHOO M18 Review 2026: The Best Ergonomic Chair Under $200?

Name: SIHOO M18
Brand: SIHOO
Availability: InStock

How we test

Every model goes through the same protocol, over several weeks in real remote-work conditions. Here are a few steps from our measurements.

Sound-level meter held near a standing desk motor — Noise measurement
Sound-level meter at the motor and mechanisms, at a constant distance.

Tape measure checking a chair's seat height — Measurements & dimensions
Seat height, depth, adjustment travel — everything is measured.

Hand testing the backrest stability of an ergonomic chair — Stability test
Backrest flex, mechanism play and recline hold.

Close-up of a chair's mesh and lumbar support — Build-quality inspection
Mesh, lumbar support and materials — build quality up close.

Our full testing method

Points forts

✓Full breathable mesh — ideal for long sessions and hot offices

✓Height-adjustable lumbar support (side knob)

✓Class-4 gas lift and 150 kg structure: solid under $200

✓Adjustable headrest, recline up to 126°

✓Unbeatable price (~$150-180) — thousands of positive long-term reviews

✓Available in many colours

SIHOO M18 Review 2026 — the entry-level chair that does the job

In short: SIHOO M18 (8.5/10, ~$150-180). The best entry point into real ergonomics: full mesh, height-adjustable lumbar, class-4 gas lift and 150 kg capacity — a rare feature set under $200. Its trade-offs (basic armrests, no lumbar depth) are logical at this price. For 4-6 hours of daily sitting, it's the budget reference.

Transparency: we have not (yet) physically tested the SIHOO M18. This review cross-references tests published by fellow specialist sites (cited at the bottom), public spec sheets and verified user feedback.

The M18 is a permanent Amazon best-seller and the #1 'budget' pick of nearly every specialist comparison — including ours, in the best ergonomic chairs 2026 comparison. Here's why.

What the M18 does well

Full mesh at a small price

Its first argument: back and seat in breathable mesh, where most chairs under $200 mix mesh and foam. In summer or an under-cooled office, the comfort difference is clear — no sweaty back at 4 pm. The W-shaped backrest fits the back well according to feedback.

A real adjustable lumbar (in height)

The lumbar support adjusts in height via a side knob: you can place it in the natural curve of your lower back (at belt level, not between the shoulder blades — the #1 adjustment mistake). It's not depth-adjustable — that's the price limit — but height-only adjustment suits most standard builds (165-185 cm).

Solid where it counts

Class-4 gas lift (the same standard as $400 chairs), a stated 150 kg structure, adjustable headrest and recline up to 126° for breaks. The M18 comes in many colours (black, white, blue, green, orange, grey…) — a rare style bonus in the category.

The trade-offs to know

The armrests

This is the fuzzy point of the listings: some tests call them height-only adjustable (1D), others fixed. Either way, no width or depth adjustment — check the product listing at purchase time if it's a criterion for you. To genuinely relieve the trapezius over 8 h/day, you need 3D armrests (the range above).

Long-term comfort

Entry-level foam and mesh compress: expect 2 to 4 years of good service under intensive use, versus 10+ years on a Steelcase or Herman Miller. The stock nylon casters should be replaced on fragile hardwood. And the seat, without depth adjustment, doesn't fit very long or very short legs.

Who is it for?

The M18 is for you if:

You work from home 2-4 days/week or 4-6 h/day
You want real lumbar support under $200
You run hot at the office (full mesh is decisive)

It's probably not the right choice if:

You sit 8+ h/day (move up to a SIHOO M57 or a Doro C300)
You have significant lower-back pain (you need depth-adjustable lumbar — see our chairs for back pain comparison)
You're over 1.90 m or 110 kg (look for a chair with seat depth adjustment)

Our verdict

The SIHOO M18 isn't a perfect chair — it's the chair that puts the essentials of ergonomics (adjustable lumbar, full mesh, class-4 gas lift) within every budget. For a first setup, a secondary workstation or moderate use, it's the best value on the market in 2026. Beyond 6 hours of daily sitting, investing in the range above is justified.

Score: 8.5/10 — the budget reference, with no bad surprises if you know its limits.

Sources checked on 2026-07-19: chaises-ergonomiques.fr — Best ergonomic office chair 2026 (€151.99 price via Amazon API, full mesh, knob lumbar, class-4 gas lift, 150 kg, weaknesses) ; passionteletravail.fr — The 8 best ergonomic chairs 2026 (colours, 126° recline, W backrest, vertically and horizontally adjustable lumbar). Warranty and armrest adjustment: manufacturer data to re-verify — sources diverge (fixed vs 1D).