SIHOO Doro C300 Pro vs Herman Miller Cosm High Back

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

SIHOO

SIHOO Doro C300 Pro

$789.99 – $839.99

Herman Miller

Herman Miller Cosm High Back

$1,925 – $2,400

9 years

longer warranty on Herman Miller Cosm High Back than SIHOO Doro C300 Pro (official terms)

Differences at a glance

SIHOO Doro C300 ProHerman Miller Cosm High Back

Price: $789.99 – $839.99$1,925 – $2,400
Seat height: 46–56.7 cm14.8–21.4 in (37.6–54.4 cm)
Seat depth: 16.81–17.76 in (≈ 42.7-45.1 cm)15.9 in (40.4 cm)
Load capacity: 330 lb (≈ 150 kg)350 lb (158.8 kg)
Arms: 6D coordinated armrests (up and down, left and right, front and back, inward and outward, with tilt-lock of armrests, and synchronized recline)Leaf Arms; Height-Adjustable Arms; Fixed Arms; No Arms; Arm Height: 7.3–11.7"
Warranty: 3 years12-year, 3-shift warranty, with limited exceptions

Which is cheaper, the SIHOO Doro C300 Pro or the Herman Miller Cosm High Back?

The SIHOO Doro C300 Pro is cheaper to start: $789.99 versus $1,925 for the Herman Miller Cosm High Back at the brand stores (Oct 2026).

Which has a higher weight capacity?

The Herman Miller Cosm High Back, rated for 350 lb versus 330 lb for the SIHOO Doro C300 Pro.