SIHOO M57 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

SIHOO M57

$319.99

FlexiSpot

FlexiSpot Soutien Ergonomic Office Chair (C5)

$249.99 – $279.99

2 years

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

Differences at a glance

SIHOO M57FlexiSpot Soutien Ergonomic Office Chair (C5)

Price: $319.99$249.99 – $279.99
Seat height: 46–55 cm (≈ 18.1-21.7 in)17.9–20.9 in
Seat depth: 18.11 in (≈ 46 cm)18.7 in
Load capacity: 330 lb (≈ 150 kg)300 lb
Recline: Reclines up to 126°95–115°
Arms: 3D coordinated armrests (up and down, left and right, forward and backward)2D
Headrest: Headrest adjusts vertically up to 3.9 inches and rotates 45 degrees2D
Lumbar support: Dual-adjustable lumbar support (vertical and horizontal)2D
Warranty: 3 years5 years

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

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