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

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

FlexiSpot

FlexiSpot Premium Ergonomic Office Chair (C7 Max)

$549.99 – $599.99

SIHOO

SIHOO M18

$289.99 – $299.99

7 years

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

Differences at a glance

FlexiSpot Premium Ergonomic Office Chair (C7 Max)SIHOO M18

Price: $549.99 – $599.99$289.99 – $299.99
Seat height: 18.5–20.9 in44–54 cm
Seat depth: 15.7–17.3 in17.91 in (≈ 45.5 cm)
Load capacity: 300 lb; 350 lb330 lb (≈ 150 kg)
Recline: 93–135°Maximum 126° recline angle
Arms: 5DAdjustable armrests (Up and down)
Headrest: 3D; 2.36 in, 135°Headrest moves 3.9" up and down and pivots 45°
Lumbar support: adjustable self-adaptive dynamicLumbar support adjusts vertically and horizontally
Warranty: 10 years3 years

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

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