X-Chair X4 vs SIHOO Doro S300

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

X-Chair

X-Chair X4

$1,199 – $1,249

SIHOO

SIHOO Doro S300

$999.99

55 lb

higher rated load for SIHOO Doro S300 than X-Chair X4 (official specs)

Differences at a glance

X-Chair X4SIHOO Doro S300

Price: $1,199 – $1,249$999.99
Seat height: 17.5–20.88 in47 – 55.5 cm (18.50 – 21.85 in)
Seat depth: 17.75–19.75 in40 – 47 cm (15.75 – 18.50 in)
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: 100°, 110°, 130°
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 - 8.875in6D coordinated armrests (up and down, left and right, front and back, inward and outward, with tilt-lock of armrests, and synchronized recline)
Headrest: Optional add-on (standard configuration: No headrest; Headrest +$150)Soft, integrated headrest; upper backrest adjusts in 5 levels
Lumbar support: Dynamic Variable Lumbar (DVL)® Support; height adjustable backrest raises the DVL®Dual dynamic lumbar support; angle 90°-105° fine-tuned with the gas lift
Warranty: 5 years (all parts and materials); 15 years (non-moving metal components, chair frame)3 years

Which is cheaper, the X-Chair X4 or the SIHOO Doro S300?

The SIHOO Doro S300 is cheaper to start: $999.99 versus $1,199 for the X-Chair X4 at the brand stores (Sep 2026).

Which has a higher weight capacity?

The SIHOO Doro S300, rated for 330 lb versus 275 lb for the X-Chair X4.

Which has a headrest?

Both: the X-Chair X4 as an option and the SIHOO Doro S300 as standard.

What do owners mention most?

Back support for the X-Chair X4, and breathability for the SIHOO Doro S300, based on review summaries.