Herman Miller Cosm Low Back vs SIHOO Doro C300 Ultra V2

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

Herman Miller

Herman Miller Cosm Low Back

$1,345 – $1,820

SIHOO

SIHOO Doro C300 Ultra V2

$679.99 – $689.99

9 years

longer warranty on Herman Miller Cosm Low Back than SIHOO Doro C300 Ultra V2 (official terms)

Differences at a glance

Herman Miller Cosm Low BackSIHOO Doro C300 Ultra V2

Price: $1,345 – $1,820$679.99 – $689.99
Seat height: 14.8–21.4 in (37.6–54.4 cm)47.5–55.5 cm (≈ 18.7-21.9 in)
Seat depth: 15.9 in (40.4 cm)16.9–18.5 in (≈ 43-47 cm)
Load capacity: 350 lb (158.8 kg)330 lb (≈ 150 kg)
Arms: Leaf Arms; Height-Adjustable Arms; Fixed Arms; No Arms; Arm Height: 7.3–11.7"8D Bionic Armrests (up, down, forward, back, rotate, or tilt)
Warranty: 12-year, 3-shift warranty, with limited exceptions3 years (covers manufacturing defects)

Which is cheaper, the Herman Miller Cosm Low Back or the SIHOO Doro C300 Ultra V2?

The SIHOO Doro C300 Ultra V2 is cheaper to start: $679.99 versus $1,345 for the Herman Miller Cosm Low Back at the brand stores (Oct 2026).

Which has a higher weight capacity?

The Herman Miller Cosm Low Back, rated for 350 lb versus 330 lb for the SIHOO Doro C300 Ultra V2.