SIHOO M18 Ergonomic Office Chair

SIHOO M18 Ergonomic Office Chair

By SIHOO · Office Chairs · Home & Workspace

  • Breathable mesh backrest
  • Adjustable headrest
  • BIFMA tested, 1136 kg static pressure test, up to 150 kg capacity

Lowest price seen
$169.99
from $169.99 at SIHOO (official D2C) · Checked Sep 28, 2026

Prices are snapshots. Check the current price with the store.

Problems, parts and running costs

Summary

A budget ergonomic office chair with a padded seat, breathable mesh back, headrest and a lumbar pad that adjusts vertically and in and out, rated for 330 lb — more adjustability than a basic task chair at a basic-chair price. Check the lumbar before your return window closes: professional testers liked it after adjustment, but it is the most consistent owner complaint, described as too hard, and some owners remove it.

Strengths

  • Two-direction lumbar adjustment (vertical and in/out) is rare at this price and is the chair’s standout feature.
  • Two independent hands-on tests found the padded seat comfortable and the chair stable.
  • The headrest, with 3.9 in of travel and a 45° pivot, comes included where many rivals omit one.
  • The 330-lb BIFMA-certified rating supports larger users.
  • Owners repeatedly mention a solid recline and a frame that doesn’t wobble or creak.
  • The current 3-year direct warranty is stronger than older marketplace material that said 2 years.

Weaknesses

  • The lumbar pad is the most consistent owner complaint: hard or intrusive, and some owners remove it entirely.
  • Armrests are height-only despite the “2D” label, and recur as hard or awkward.
  • Seat depth is fixed at 17.91 in, which limits fit for some body types.
  • Stock casters collect hair and dirt and can roll poorly or resist turning.
  • Some owners find the seat hard or flattening on long days, with tailbone discomfort, even though testers liked it.

Verified specifications

Dimensions (current US listing)28 W × 27 D × 44–51 H in; 37.1 lb.
Seat depth17.91 in; maximum hip width 20.08 in.
Maximum load330 lb (about 150 kg), BIFMA certified.
Reclineto 126°.
Headrest3.9 in of vertical travel and a 45° pivot.
Lumbaradjusts vertically and in and out.
Armrestsheight adjustment only; no fore/aft or width adjustment is established.
Seat depth is fixed; there is no adjustment.
Materialspolyester mesh back, sponge seat padding, steel/aluminum/nylon frame parts, polypropylene back and headrest frame.
Warranty3 years when bought direct in the US; marketplace coverage depends on the channel.
Assembly required; TechGearLab put its unit together in 16 minutes.
Entirely mechanical; no electrical parts.
Full research notes and sources

Fit and adjustments

The M18 suits mid-size users best. The headrest moves 3.9 in vertically and pivots 45°, a tester about 6 ft 2 in fit the backrest, and the lumbar pad slides up and down as well as in and out. The limits are the arms and the seat: no width or fore/aft arm adjustment, and no way to shorten the 17.91-in seat. Dimension listings differ sharply between regions, so a spec sheet from SIHOO’s European pages will not match the US chair; trust the US numbers.

Comfort over a long day

TechGearLab bought its unit and scored it 66/100, with 7.4/10 comfort, 5.8/10 adjustability and 5.4/10 assembly, and got about seven comfortable hours per day from it. The testers liked the seat and the adjustable lumbar but found the adjustments stiff, the armrests hard and the casters difficult to roll. COMPUTER BILD, a German outlet, independently rated it 2.4 (“good”) and praised seat comfort, easy assembly and stability, while criticizing a hard back-support area and casters that quickly collect dirt. Owner experience splits on the same line: people whose body shape matches the lumbar often like it; others find it painfully aggressive.

Durability and upkeep

Durability evidence is better than the price suggests. Owner reports include 2+ years at roughly 9–10 hours per day and another 4+ years of daily use with the mesh, foam and gas lift still serviceable. Isolated problems recur in threads — squeaking, loose armrest screws, weakening recline tension, torn arm pads, one weld failure after years — but those are signals, not a failure rate. Upkeep is basic: re-tighten the armrest bolts now and then and clean hair out of the caster axles. The current US warranty is 3 years, and SIHOO favors mailing replacement parts for smaller covered problems.

Is it worth it?

Buy it on sale. Owners repeatedly call it strong value at its typical selling price, and it stays reasonable at SIHOO’s own direct price. Near the inflated crossed-out list price it stops making sense: with fixed seat depth, height-only arms and a polarizing lumbar pad, the same money in the used market gets a commercial chair.

Which model this is

This page covers the SIHOO M18 Ergonomic Office Chair with Soft Cushion & Spine Support — the mesh-back chair with a sponge seat, not a full-mesh chair, and not the M57, C300 or M18C variants. The Amazon listing for the US model is ASIN B07GNDDNMW; Best Buy sells the same chair under SKU 10148359, and a Best Buy variant with a footrest is a different listing.

Sources

Manufacturer:

Independent reviews:

Owner reports:

Buying guides for this category

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