SIHOO M59AS vs FlexiSpot Standard Ergo Office Chair (C4)

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

SIHOO

SIHOO M59AS

$449.99

FlexiSpot

FlexiSpot Standard Ergo Office Chair (C4)

$219.99 – $239.99

$230

lower starting price for FlexiSpot Standard Ergo Office Chair (C4) than SIHOO M59AS at the brand stores

Differences at a glance

SIHOO M59ASFlexiSpot Standard Ergo Office Chair (C4)

Price: $449.99$219.99 – $239.99
Seat height: 46.5–56.5 cm17.91–20.87 in
Seat depth: 17.13 in (≈ 43.5 cm)19.49 in
Load capacity: 330 lb (≈ 150 kg)300 lb
Recline: Recline up to 126°90–135°
Arms: 3D coordinated flip-up armrests (flip up and down, left and right, forward and backward)3D
Headrest: Double-jointed headrest (height and angle)3D
Lumbar support: Dynamic lumbar support in a dual-section backrestfixed
Warranty: 3 years5 years

Which is cheaper, the SIHOO M59AS or the FlexiSpot Standard Ergo Office Chair (C4)?

The FlexiSpot Standard Ergo Office Chair (C4) is cheaper to start: $219.99 versus $449.99 for the SIHOO M59AS at the brand stores (Oct 2026).

Which has a higher weight capacity?

The SIHOO M59AS, rated for 330 lb versus 300 lb for the FlexiSpot Standard Ergo Office Chair (C4).

Which has a headrest?

Both: the SIHOO M59AS as standard and the FlexiSpot Standard Ergo Office Chair (C4) as standard.