SIHOO Doro C300 Ultra V2 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 Ultra V2
$679.99 – $689.99
VS
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 Ultra V2 (official terms)
Differences at a glance
Sources
- Doro C300 Ultra V2 Zero‑Gravity Full‑Body Adaptive Ergonomic Chair – UK Sihoo official Shop ↗Checked Oct 13, 2026
- Cosm Specs - Herman Miller ↗Checked Sep 29, 2026
- Sihoo Doro C300 Ultra V2 | Ergonomic Office Chair – Official US Sihoo Store ↗Checked Oct 13, 2026
- High-Back Cosm Chair - Herman Miller Store ↗Checked Sep 29, 2026
- US Herman Miller Store (price) ↗Checked Oct 11, 2026
SIHOO Doro C300 Ultra V2Herman Miller Cosm High Back
- Price
- $679.99 – $689.99$1,925 – $2,400
- Seat height
- 47.5–55.5 cm (≈ 18.7-21.9 in)14.8–21.4 in (37.6–54.4 cm)
- Seat depth
- 16.9–18.5 in (≈ 43-47 cm)15.9 in (40.4 cm)
- Load capacity
- 330 lb (≈ 150 kg)350 lb (158.8 kg)
- Arms
- 8D Bionic Armrests (up, down, forward, back, rotate, or tilt)Leaf Arms; Height-Adjustable Arms; Fixed Arms; No Arms; Arm Height: 7.3–11.7"
- Warranty
- 3 years (covers manufacturing defects)12-year, 3-shift warranty, with limited exceptions
Questions
Which is cheaper, the SIHOO Doro C300 Ultra V2 or the Herman Miller Cosm High Back?
The SIHOO Doro C300 Ultra V2 is cheaper to start: $679.99 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 Ultra V2.
SIHOO Doro C300 Ultra V2: specs, reviews, where to buy →Herman Miller Cosm High Back: specs, reviews, where to buy →
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More comparisons
- SIHOO Doro C300 Ultra V2 vs SIHOO Doro S300 Arms: 8D Bionic Armrests on SIHOO Doro C300 Ultra V2; 6D coordinated armrests on SIHOO Doro S300.
- Herman Miller Cosm High Back vs Steelcase Gesture Arms: Leaf Arms on Herman Miller Cosm High Back; Width 10.25–22.5 in between arms on Steelcase Gesture.
- Herman Miller Cosm High Back vs Okamura Contessa II Arms: Leaf Arms on Herman Miller Cosm High Back; 4D arm or fixed arm on Okamura Contessa II.
- Herman Miller Cosm High Back vs Steelcase Leap V2 Load capacity: 350 lb on Herman Miller Cosm High Back; 400 lb on Steelcase Leap V2.
- Herman Miller Cosm High Back vs Humanscale Freedom Arms: Leaf Arms on Herman Miller Cosm High Back; 6 in range of vertical motion on Humanscale Freedom.