SIHOO Doro S300 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 S300

$999.99

Herman Miller

Herman Miller Cosm High Back

$1,925 – $2,400

9 years

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

Differences at a glance

SIHOO Doro S300Herman Miller Cosm High Back

Price: $999.99$1,925 – $2,400
Seat height: 47 – 55.5 cm (18.50 – 21.85 in)14.8–21.4 in (37.6–54.4 cm)
Seat depth: 40 – 47 cm (15.75 – 18.50 in)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

From 0 SIHOO Doro S300 and 33 Herman Miller Cosm High Back user reviews, most mentioned first. Green is liked, orange is a caution.

Comfort
SIHOO Doro S3006 mentions
Herman Miller Cosm High Back31 mentions
Adjustability
SIHOO Doro S3006 mentions
Herman Miller Cosm High Back31 mentions
Design
SIHOO Doro S3005 mentions
Herman Miller Cosm High Back23 mentions
Recline and tilt
SIHOO Doro S3003 mentions
Herman Miller Cosm High Back19 mentions
Price and value
SIHOO Doro S3007 mentions
Herman Miller Cosm High Back11 mentions
Armrests
SIHOO Doro S3006 mentions
Herman Miller Cosm High Back12 mentions

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

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

What do owners mention most?

Breathability for the SIHOO Doro S300, and comfort for the Herman Miller Cosm High Back, based on review summaries.