X-Chair X3 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.

X-Chair

X-Chair X3

$979

SIHOO

SIHOO Doro C300 Ultra V2

$679.99 – $689.99

$299.01

lower starting price for SIHOO Doro C300 Ultra V2 than X-Chair X3 at the brand stores

Differences at a glance

X-Chair X3SIHOO Doro C300 Ultra V2

Price: $979$679.99 – $689.99
Seat height: 17.69–22 in47.5–55.5 cm (≈ 18.7-21.9 in)
Seat depth: 16.75–19.25 in16.9–18.5 in (≈ 43-47 cm)
Load capacity: 275 lb (125 kg)330 lb (≈ 150 kg)
Recline: SciFloat Infinite Recline + Tilt Lock and Tension allows you to recline and lock into position or increase tension in your recline motion for more fluid movement.Recline Angles 105°, 120°, 135°
Arms: 4-Dimensional armrests come standard (up, down, side-to-side, front-to-back); option to upgrade to FS 360 rotational armrests; Armrest Height 5.875in - 8.875in8D Bionic Armrests (up, down, forward, back, rotate, or tilt)
Headrest: Optional add-on (standard configuration: No headrest; Headrest +$115)Ultra-wide 3D headrest, adjusts in three directions
Lumbar support: Dynamic Variable Lumbar (DVL)® Support; height adjustable backrest raises the DVL®Domino™ Sacral-Lumbar Support 2.0: moves up or down, 3 support levels
Warranty: 5 years (all parts and materials); 15 years (non-moving metal components, chair frame)3 years (covers manufacturing defects)

Which is cheaper, the X-Chair X3 or the SIHOO Doro C300 Ultra V2?

The SIHOO Doro C300 Ultra V2 is cheaper to start: $679.99 versus $979 for the X-Chair X3 at the brand stores (Sep 2026).

Which has a higher weight capacity?

The SIHOO Doro C300 Ultra V2, rated for 330 lb versus 275 lb for the X-Chair X3.

Which has a headrest?

Both: the X-Chair X3 as an option and the SIHOO Doro C300 Ultra V2 as standard.