Herman Miller Cosm Low Back vs SIHOO Doro S300

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 S300

$999.99

9 years

longer warranty on Herman Miller Cosm Low Back than SIHOO Doro S300 (official terms)

Differences at a glance

Herman Miller Cosm Low BackSIHOO Doro S300

Price: $1,345 – $1,820$999.99
Seat height: 14.8–21.4 in (37.6–54.4 cm)47 – 55.5 cm (18.50 – 21.85 in)
Seat depth: 15.9 in (40.4 cm)40 – 47 cm (15.75 – 18.50 in)
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"6D coordinated armrests (up and down, left and right, front and back, inward and outward, with tilt-lock of armrests, and synchronized recline)
Warranty: 12-year, 3-shift warranty, with limited exceptions3 years

From 3 Herman Miller Cosm Low Back and 0 SIHOO Doro S300 user reviews, most mentioned first. Green is liked, orange is a caution.

Comfort
Herman Miller Cosm Low Back7 mentions
SIHOO Doro S3006 mentions
Recline and tilt
Herman Miller Cosm Low Back9 mentions
SIHOO Doro S3003 mentions
Price and value
Herman Miller Cosm Low Back5 mentions
SIHOO Doro S3007 mentions
Adjustability
Herman Miller Cosm Low Back5 mentions
SIHOO Doro S3006 mentions
Design
Herman Miller Cosm Low Back5 mentions
SIHOO Doro S3005 mentions
Size and fit
Herman Miller Cosm Low Back6 mentions
SIHOO Doro S3003 mentions

Which is cheaper, the Herman Miller Cosm Low Back or the SIHOO Doro S300?

The SIHOO Doro S300 is cheaper to start: $999.99 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 S300.

What do owners mention most?

Recline and tilt for the Herman Miller Cosm Low Back, and breathability for the SIHOO Doro S300, based on review summaries.