SIHOO M18 vs FlexiSpot Soutien Ergonomic Office Chair (C5)

Side by side from official specifications, sourced prices and User Insights. No written comparison exists for this pair yet.

SIHOO M18

SIHOO

SIHOO M18

$289.99 – $299.99

VS
FlexiSpot Soutien Ergonomic Office Chair (C5)

FlexiSpot

FlexiSpot Soutien Ergonomic Office Chair (C5)

$249.99 – $279.99

2 years

longer warranty on FlexiSpot Soutien Ergonomic Office Chair (C5) than SIHOO M18 (official terms)

Differences at a glance

SIHOO M18FlexiSpot Soutien Ergonomic Office Chair (C5)
Price
$289.99 – $299.99$249.99 – $279.99
Seat height
44–54 cm17.9–20.9 in
Seat depth
17.91 in (≈ 45.5 cm)18.7 in
Load capacity
330 lb (≈ 150 kg)300 lb
Recline
Maximum 126° recline angle95–115°
Arms
Adjustable armrests (Up and down)2D
Headrest
Headrest moves 3.9" up and down and pivots 45°2D
Lumbar support
Lumbar support adjusts vertically and horizontally2D
Warranty
3 years5 years

Questions

Which is cheaper, the SIHOO M18 or the FlexiSpot Soutien Ergonomic Office Chair (C5)?

The FlexiSpot Soutien Ergonomic Office Chair (C5) is cheaper to start: $249.99 versus $289.99 for the SIHOO M18 at the brand stores (Oct 2026).

Which has a higher weight capacity?

The SIHOO M18, rated for 330 lb versus 300 lb for the FlexiSpot Soutien Ergonomic Office Chair (C5).

Which has a headrest?

Both: the SIHOO M18 as standard and the FlexiSpot Soutien Ergonomic Office Chair (C5) as standard.

SIHOO M18: specs, reviews, where to buy →FlexiSpot Soutien Ergonomic Office Chair (C5): specs, reviews, where to buy →

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