X-Chair X3 vs Herman Miller Cosm Mid 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 Mid Back

$2,030

$1,051

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

Differences at a glance

X-Chair X3Herman Miller Cosm Mid Back

Price: $979$2,030
Seat height: 17.69–22 in14.875–21 in
Seat depth: 16.75–19.25 in15.5 in
Load capacity: 275 lb (125 kg)350 lb
Warranty: 5 years (all parts and materials); 15 years (non-moving metal components, chair frame)12 years

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

The X-Chair X3 is cheaper to start: $979 versus $2,030 for the Herman Miller Cosm Mid Back at the brand stores (Sep 2026).

Which has a higher weight capacity?

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