X-Chair X3 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.

X-Chair

X-Chair X3

$979

Herman Miller

Herman Miller Cosm High Back

$1,925 – $2,400

$946

lower starting price for X-Chair X3 than Herman Miller Cosm High Back at the brand stores

Differences at a glance

X-Chair X3Herman Miller Cosm High Back

Price: $979$1,925 – $2,400
Seat height: 17.69–22 in14.8–21.4 in (37.6–54.4 cm)
Seat depth: 16.75–19.25 in15.9 in (40.4 cm)
Load capacity: 275 lb (125 kg)350 lb (158.8 kg)
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 - 8.875inLeaf Arms; Height-Adjustable Arms; Fixed Arms; No Arms; Arm Height: 7.3–11.7"
Warranty: 5 years (all parts and materials); 15 years (non-moving metal components, chair frame)12-year, 3-shift warranty, with limited exceptions

Which is cheaper, the X-Chair X3 or the Herman Miller Cosm High Back?

The X-Chair X3 is cheaper to start: $979 versus $1,925 for the Herman Miller Cosm High Back at the brand stores (Sep 2026).

Which has a higher weight capacity?

The Herman Miller Cosm High Back, rated for 350 lb versus 275 lb for the X-Chair X3.

What do owners mention most?

Comfort for the X-Chair X3, and comfort for the Herman Miller Cosm High Back, based on review summaries.