FlexiSpot Soutien Ergonomic Office Chair (C5) vs SIHOO M57

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

FlexiSpot

FlexiSpot Soutien Ergonomic Office Chair (C5)

$249.99 – $279.99

SIHOO

SIHOO M57

$319.99

2 years

longer warranty on FlexiSpot Soutien Ergonomic Office Chair (C5) than SIHOO M57 (official terms)

Differences at a glance

FlexiSpot Soutien Ergonomic Office Chair (C5)SIHOO M57

Price: $249.99 – $279.99$319.99
Seat height: 17.9–20.9 in46–55 cm (≈ 18.1-21.7 in)
Seat depth: 18.7 in18.11 in (≈ 46 cm)
Load capacity: 300 lb330 lb (≈ 150 kg)
Recline: 95–115°Reclines up to 126°
Arms: 2D3D coordinated armrests (up and down, left and right, forward and backward)
Headrest: 2DHeadrest adjusts vertically up to 3.9 inches and rotates 45 degrees
Lumbar support: 2DDual-adjustable lumbar support (vertical and horizontal)
Warranty: 5 years3 years

Which is cheaper, the FlexiSpot Soutien Ergonomic Office Chair (C5) or the SIHOO M57?

The FlexiSpot Soutien Ergonomic Office Chair (C5) is cheaper to start: $249.99 versus $319.99 for the SIHOO M57 at the brand stores (Oct 2026).

Which has a higher weight capacity?

The SIHOO M57, rated for 330 lb versus 300 lb for the FlexiSpot Soutien Ergonomic Office Chair (C5).

Which has a headrest?

Both: the FlexiSpot Soutien Ergonomic Office Chair (C5) as standard and the SIHOO M57 as standard.