SIHOO · Office Chairs

SIHOO M59AS

SIHOO · Brand founded 2011 · Shenzhen, China

People with small desks who want flip-up arms, a 46.5–56.5 cm seat-height range and a two-part mesh back.

$449.99

  • Headrest: Double-jointed headrest
  • Up to 330 lb
  • 3-year warranty
Check price on Amazon
Check price at SIHOO ↗

Summary

A SIHOO mesh chair with a two-section backrest, flip-up arms and a 126° recline.

Best for

  • People who want flip-up arms to slide under the desk.
  • Those who want a split backrest that follows the upper and lower back.

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's US page lists no user height range, so compare the official seat dimensions with your build.
  • Returns need the chair unused and in its original packaging, so keep the box until you are sure.

The trade-off

A distinctive split back at a mid price, with little user evidence collected so far.

Value check

Lists at $449.99 in the US, about $50 less than the C300 Pro V2.

Price
$449.99
Load capacity
330 lb
Warranty
3 years

What SIHOO highlights

  • Dual-section backrest

    The backrest is split into two sections that follow the spine. SIHOO says it keeps a natural S-shape.

  • Dynamic lumbar support

    The lumbar support adjusts to the lower back's curve. SIHOO says it stays comfortable whether you sit still or move.

  • 3D flip-up armrests

    The arms move up and down, back and forth, rotate, and flip up.

  • Double-jointed headrest

    The headrest adjusts in height and rotates. SIHOO says this aligns it with your posture.

  • 126° recline

    The back reclines up to 126°. SIHOO presents this as room to lean back and take a break.

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

What users say

What users love

  • Comfortable for long sessions

    Users say it stays comfortable through long work and study days, and several prefer it to the gaming chair they replaced.

  • A back that feels better

    Users with long desk days mention less lower-back soreness, and one could sit for hours without shoulder or neck tension.

  • Arms that flip out of the way

    Users like lifting the armrests up, and guitar players say it leaves room to play.

  • Cool, breathable mesh

    Users in warm rooms say the mesh seat stays cooler than leather or thick padding.

  • Two ways to lean

    Users like a small rocking give for work and a deeper lean for resting.

  • Good value and helpful support

    Users call it solid for the price, and several had parts or fit problems sorted quickly.

Most-mentioned topics

  1. 1. Lumbar support7 owners · 14% positive
  2. 2. Overall comfort4 owners · 50% positive
  3. 3. Creaks and squeaks2 owners · 0% positive
  4. 4. Headrest2 owners · 50% positive

What users repeat

  • The spring lumbar is the most raised issue: users say it sits low or presses too hard.
  • Sliding the backrest rearward using the screws under the seat helped several users.

Good to know

  • Tip: if the headrest pushes your head forward, try it lower or without the headrest; several users prefer it off.
  • Tip: the lumbar is spring-loaded and fixed; users over about 6 ft say it sits low, and sliding the backrest rearward with the screws under the seat helps some.
  • Tip: the arms mount to the backrest and adjust by flipping, not by height; check this if you lean on them.
  • Tip: retighten the bolts after the first weeks, or tape the leg cover, to stop squeaks and rattles.
  • Tip: the stock wheels feel stiff on some floors; rubber casters are an easy swap.
  • Tip: check the chair over when it arrives; one user found a dented part and chose a refund over a two-month wait for a replacement.

Summarised in our own words from 10 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 over about 180 cm: Two tall users say the lumbar and headrest sit low for them.

Where users disagree

  • Overall comfort

    One side: Some users sit in it for long sessions and find it comfortable and cool.

    Other side: Others say the back feels unsupported, especially with the recline locked.

Detailed topics

  • Lumbar sits too low or presses too hard · 6 users
    What users did: Loosen the screws under the seat and slide the backrest rearward so the lumbar sits higher; three users say this helped.
  • Arrived with a dented part and a badly fitted badge · 1 user
    What users did: The user was offered partial credit and a replacement in about two months, refused, and was refunded.

Topic notes

  • Lumbar support: The spring-loaded lumbar is the main issue: users say it sits too low, presses too hard, or gives little support.
  • Overall comfort: Two users use it for long sessions without thinking about it; two found it unsupportive, and one switched to another chair.
  • Creaks and squeaks: Early creaks fixed by retightening bolts; another user oils it to stop squeaking.
  • Headrest: Sits too low for one user over 180 cm; another removed it and prefers the chair without it.

After long-term use

Long-term (6+ months)

Two users describe roughly six months to a year of use: it still holds up, but one retightened bolts to stop creaks and the other oils it to stop squeaks.

Only users describing six months or more of use.

Before you buy

Fit (official)

  • Rated to 330 lb (US store); UK store lists 300 lb (136 kg).
  • Seat height 46.5–56.5 cm (18.3–22.2 in), UK store.

Delivery and setup

  • Net weight 36.7 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

  • The lumbar is spring-loaded, not height-adjustable; users fixed a low lumbar by moving the backrest mount rearward.

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

Check price on Amazon

Specs

Size and fit
Sizes
45–53 in
Seat height
46.5–56.5 cm
Seat depth
17.13 in (43.5 cm)
Seat width
50.5 cm
Load capacity
330 lb (150 kg)
Adjustments
Recline
Recline up to 126°
Arms
3D coordinated flip-up armrests (flip up and down, left and right, forward and backward)
Lumbar support
Dynamic lumbar support in a dual-section backrest
Headrest
Double-jointed headrest (height and angle)
Build and warranty
Warranty
3 years
Chair weight
36.7 lb (16.6 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 M59AS cost?

It costs $449.99 at the SIHOO US Official Store (Black and White $449.99 (list = the store's compare-at price; on 2026-10-09 the store showed $239.99)), checked Oct 2026.

What is the SIHOO M59AS's weight capacity?

It is rated for 330 lb for the M59AS (US official specifications), according to SIHOO's official specifications.

Does the SIHOO M59AS have a headrest?

Yes. The official specifications list: Double-jointed headrest.

What sizes or versions of the SIHOO M59AS are there?

It comes in general Dimensions: 28"W x 28"D x 45"-53"H.

Where can I buy the SIHOO M59AS?

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

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Where to buy

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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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