SIHOO M18 vs Branch Ergonomic Chair: Specs, Warranty and Price

Research note: This comparison uses each brand's published specifications (SIHOO US official store; Branch product page and product spec sheet), not a hands-on Chairpedia test. Figures are quoted as each brand states them, with the page they come from.

Introduction

The SIHOO M18 and the Branch Ergonomic Chair are mesh-back task chairs that sit in the lower part of the ergonomic chair market. In one sentence: the M18 lists lower, includes a headrest and has the higher load rating, while the Branch publishes a full seat height and seat depth range, has 3D arms, and carries a much longer warranty. SIHOO does not publish a seat height for the M18, so that part of the comparison is one-sided and we say so where it matters.

At a glance

SIHOO M18 — strengths and weaknesses

Documented features: SIHOO's US store lists general dimensions of 28 in wide, 27 in deep and 44-51 in high, a seat depth of 17.91 in, a 330 lbs maximum load, a maximum recline angle of 126°, armrests that adjust up and down, a lumbar support that adjusts vertically and horizontally, a headrest that moves 3.9 in up and down and pivots 45°, a product weight of 37.1 lbs and a three-year warranty.

Check before buying: SIHOO does not publish a seat height range for the M18; it is not published by the brand, so check the overall height against your desk or ask the store. The seat depth is a single figure, with no adjustment listed. The armrests move up and down only. The regular US price is $289.99 for Black (including the Skate Wheels version) and $299.99 for the other colours.

Branch Ergonomic Chair — strengths and weaknesses

Documented features: Branch lists a seat height of 17-21 in (43-53 cm) with the standard cylinder and a seat depth adjustment range of 18-22 in (46-56 cm). The overall size is 25 in wide, 24 in deep and 38-42 in high. The 3D armrests are removable and adjust in depth, height and width, with an armrest height of 26-29 in and an armrest width of 25-29 in. The lumbar rest is height-adjustable and removable. Branch lists a tilt range of 20°, a 275 lb weight capacity, an assembled weight of 35 lb on its spec sheet, and a 7-year warranty.

Check before buying: The headrest is an optional add-on sold separately, and the regular price of $369 (black on black frame) to $389 (colour upholstery with white frame) excludes it. The 275 lb capacity is lower than the M18's. Branch's product page and spec sheet give different chair weights; we show the spec sheet's assembled figure.

How they differ

Price. At regular US prices the M18 ($289.99-$299.99) lists roughly 80 to 90 dollars below the Branch ($369-$389), and the Branch gap widens if you add its optional headrest.

Warranty. 7-year on the Branch against three years on the M18, the largest single difference between the two.

Seat. Branch publishes both a seat height (17-21 in) and an adjustable seat depth (18-22 in). SIHOO publishes only a fixed 17.91 in seat depth for the M18 and no seat height, so shorter and taller sitters have more to go on with the Branch.

Load. 330 lbs for the M18 against 275 lb for the Branch.

Recline. SIHOO lists a maximum recline angle of 126°; Branch lists a tilt range of 20°. The two brands measure differently, so the figures are not directly comparable.

Arms, lumbar and headrest. The Branch arms move in three directions and come off; the M18 arms move up and down. Both lumbar pads move vertically, and the M18's also moves horizontally. The M18 includes a headrest; on the Branch it costs extra.

Who should buy which

Pick the SIHOO M18 if you want a headrest included at the lower list price, need the higher 330 lbs load rating, or want to set the lumbar pad horizontally as well as vertically. Pick the Branch Ergonomic Chair if you want a published seat height and seat depth adjustment to check against your body and desk before buying, arms that move in three directions, and the 7-year warranty. If you like the M18 but want 4D arms and a lumbar that follows the backrest, the SIHOO Doro C300 is the next step up in SIHOO's range.

Sources

• SIHOO US Official Store — M18 product page (specifications, regular prices, warranty), checked 2026-09-29 and 2026-10-07.
• Branch — Ergonomic Chair product page and Product Spec Sheet (PDF) (specifications, warranty, regular price), checked 2026-09-29.

Bottom line

The SIHOO M18 is the lower-priced chair with a built-in headrest and a 330 lbs load rating. The Branch Ergonomic Chair costs more, publishes a fuller set of seat measurements, offers seat depth adjustment and 3D arms, and carries a 7-year warranty. Because SIHOO does not publish the M18's seat height, check the live store page or ask SIHOO if your desk height is tight.