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SIHOO · Office Chairs

SIHOO M18

SIHOO · Brand founded 2011 · Shenzhen, China

Budget home office with an adjustable headrest and lumbar support.

$289.99 – $299.99

  • Up to 330 lb
  • 3-year warranty
Check price on Amazon
Check price at SIHOO ↗

Summary

A budget SIHOO chair with a foam seat and mesh back, for those who avoid mesh seats.

Best for

  • People who prefer a cushioned foam seat over mesh.
  • Budget buyers who want lumbar adjustable in height and depth.

Good to check first

  • The recline stops at 126°, so look at a deeper-reclining model if you like to nap in your chair.
  • SIHOO lists height adjustment for the arms; check this if you want more arm positions.
  • Returns need the chair unused and in its original packaging, so keep the box until you are sure.

The trade-off

A cushioned seat and simple controls at a low price, with fewer adjustments than newer models.

Value check

Lists from $289.99 in the US, about $30 less than the M57.

Price
$289.99 – $299.99
Load capacity
330 lb
Warranty
3 years

What SIHOO highlights

  • W-shaped cushion

    The seat is a W-shaped foam cushion. SIHOO describes it as soft and cozy.

  • Mesh backrest

    The back is mesh for air circulation. SIHOO says it keeps you cool through the workday.

  • Dual-adjustable lumbar

    The lumbar support moves vertically and horizontally. SIHOO says this aligns it with your spine.

  • Height-adjustable arms

    The armrests adjust in height to support the arms and shoulders.

  • Headrest and 126° recline

    The headrest moves 3.9 in up and down and pivots 45°, and the back reclines to 126°.

As described by SIHOO on its official pages; not a Chairpedia assessment.

What users say

What users love

  • Good value

    Users see it as a sensible, low-cost way into an ergonomic chair, and one has bought four.

  • Sturdy and long-lasting

    Users praise the metal base and a firm cushion that holds its shape.

  • Comfortable desk hours

    Users say it supports them through long days, with a mesh back that stays cool.

  • Helpful support

    Users say replacement parts arrived within about a week and the company followed up.

Most-mentioned topics

  1. 1. Seat firmness3 owners · 33% positive
  2. 2. Value3 owners · 100% positive
  3. 3. Durability3 owners · 33% positive
  4. 4. Adjustments3 owners · 33% positive
  5. 5. Mesh back2 owners · 100% positive

What users repeat

  • The seat is very firm; some like it, others find it too hard.
  • Users see it as a sensible budget chair, not a match for premium chairs.

Good to know

  • Tip: the seat is very firm; if you prefer softness, plan for a cushion.
  • Tip: around 5 ft tall? Check the seat height range before buying.
  • Tip: the adjustments can feel loose, so set them once and check them now and then.
  • Tip: the armrest edges can feel sharp to some, and the arms only move up and down.

Summarised in our own words from 9 user reports in online user discussions (2025–2026). Each user is counted once; sale and promotional posts, repeats and other models are left out.

More details →

Who it suits, who it doesn't

  • Less suited to users around 5 ft: A 5 ft user says it is not ideal for their height, though they like the chair.

Where users disagree

  • Seat firmness

    One side: One user finds the firm seat comfortable.

    Other side: Two users call it one of the hardest seats they have sat on.

Topic notes

  • Seat firmness: The padded seat is very firm; one user likes that, two find it too hard.
  • Value: Users see it as a reasonable budget option.
  • Durability: Opinions differ: one says the pad holds up; one says it hardened after two years; one worries about loose adjustments.
  • Adjustments: Adjustments work but feel loose or less precise than pricier chairs.
  • Mesh back: The mesh back is breathable.

After long-term use

After six months to 2 years

Two users describe six months or more: one finds it still adequate at six months; another says the seat padding became very hard after about two years.

Only users describing six months or more of use.

Before you buy

Fit (official)

  • Rated to 330 lb.

Delivery and setup

  • Net weight 37.1 lb.

Returns (official policy)

  • SIHOO store: 30-day returns from delivery, return shipping free.
  • The chair must be unused and in its original packaging.

Users suggest checking

  • If you prefer a soft seat, note that users describe the M18 seat as very firm.

Sources: SIHOO US official store ↗ (checked Oct 10, 2026) · SIHOO refund policy ↗ (checked Oct 10, 2026)

Check price on Amazon

Specs

Size and fit
Sizes
44–51 in
Seat height
44–54 cm
Seat depth
17.91 in (45.5 cm)
Load capacity
330 lb (150 kg)
Adjustments
Recline
Maximum 126° recline angle
Arms
Adjustable armrests (Up and down)
Lumbar support
Lumbar support adjusts vertically and horizontally
Headrest
Headrest moves 3.9" up and down and pivots 45°
Build and warranty
Warranty
3 years
Chair weight
37.1 lb (16.8 kg)
Made in
China (Foshan); SIHOO states this for all its products

About SIHOO

Founded
2011
Based in
Shenzhen, China
Manufacturing
Foshan, China

SIHOO launched its brand in 2011 and opened an ergonomics museum in 2012. It set up dedicated research facilities in 2016, according to its own timeline.

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Questions

How much does the SIHOO M18 cost?

It costs $289.99 – $299.99 at the SIHOO US Official Store (Black (incl. Skate Wheels) $289.99; White/Blue/Green/Pink $299.99), checked Oct 2026.

What is the SIHOO M18's weight capacity?

It is rated for 330 lb in M18, according to SIHOO's official specifications.

Does the SIHOO M18 have a headrest?

Yes. The official specifications list: Headrest moves 3.9" up and down and pivots 45°.

What sizes or versions of the SIHOO M18 are there?

It comes in general Dimensions: 28"W x 27"D x 44"-51"H.

What do owners say about back pain with the SIHOO M18?

Back pain comes up in 2 owner review summaries. These are owners' own reports, not medical findings.

Where can I buy the SIHOO M18?

You can buy it from Amazon, the SIHOO US Official Store or Amazon (Light Blue). Check the configuration, price and return terms before ordering.

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Where to buy

Amazon returns are typically 30 days of delivery but set per listing — check before ordering. Some links are affiliate links; Chairpedia may earn a commission at no extra cost to you (disclosure).

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Specs and prices come from the brand sources listed under Specs and next to the price; User Insights link to their originals. Confirm the exact configuration, seller and price before buying. Editorial policy

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