SIHOO M18 vs FlexiSpot Premium Ergonomic Office Chair (C7 Max)

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

SIHOO

SIHOO M18

$289.99 – $299.99

FlexiSpot

FlexiSpot Premium Ergonomic Office Chair (C7 Max)

$549.99 – $599.99

7 years

longer warranty on FlexiSpot Premium Ergonomic Office Chair (C7 Max) than SIHOO M18 (official terms)

Differences at a glance

SIHOO M18FlexiSpot Premium Ergonomic Office Chair (C7 Max)

Price: $289.99 – $299.99$549.99 – $599.99
Seat height: 44–54 cm18.5–20.9 in
Seat depth: 17.91 in (≈ 45.5 cm)15.7–17.3 in
Load capacity: 330 lb (≈ 150 kg)300 lb; 350 lb
Recline: Maximum 126° recline angle93–135°
Arms: Adjustable armrests (Up and down)5D
Headrest: Headrest moves 3.9" up and down and pivots 45°3D; 2.36 in, 135°
Lumbar support: Lumbar support adjusts vertically and horizontallyadjustable self-adaptive dynamic
Warranty: 3 years10 years

Which is cheaper, the SIHOO M18 or the FlexiSpot Premium Ergonomic Office Chair (C7 Max)?

The SIHOO M18 is cheaper to start: $289.99 versus $549.99 for the FlexiSpot Premium Ergonomic Office Chair (C7 Max) 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 Premium Ergonomic Office Chair (C7 Max).

Which has a headrest?

Both: the SIHOO M18 as standard and the FlexiSpot Premium Ergonomic Office Chair (C7 Max) as standard.