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Humanscale

Humanscale Diffrient World Task Chair | Black Catena Mesh Seat and Back | Black Frame, Black Trim | Height-Adjustable Duron Arms | Standard Foam Seat, 3" Carpet Casters, 5" Cylinder

Very Good

Mesh back
400 lb capacity
Seat depth adjustment
Synchro or weight-activated tilt

$768.80

In stock on Amazon.com

Specs verified October 2026

Amazon.com data updated October 13, 2026, 2:34 pm ET. Price and availability are accurate as of the time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply.

Ergo Score Breakdown

Ergo Score: 49/100

Adjustability 18/40

Armrests3/101D armrests: 3/10

Seat height6/6adjustable, 5.2 in range: 6/6

Seat depth5/5seat depth adjustment: 5/5

Lumbar adjustment0/7Not listed by the seller

Recline0/2Not listed by the seller

Tilt lock0/3tilt without stated lock: 0/3

Tilt tension0/3Not listed by the seller

Advanced tilt4/4weight-sensitive recline: 4/4

Support 16/30

Lumbar support12/12lumbar support: 12/12

Upper back support0/4Not listed by the seller

Headrest adjustment0/2Not listed by the seller

Cushion0/5foam seat: 0/5

Seat edge0/3Not listed by the seller

Breathable back4/4mesh back: 4/4

Build 15/30

Warranty9/915-year warranty: 9/9

Weight capacity6/6400 lb capacity: 6/6

Certifications0/5Not listed by the seller

Base0/3Not listed by the seller

Gas lift0/2Not listed by the seller

Owner rating0/5Not listed by the seller

Comfort Index

Comfort Index: 33/100

Seat cushion8/20

Cushion thicknessNot listed by the seller

ReclineNot listed by the seller

Breathable back15/15

HeadrestNot listed by the seller

Armrests10/10

Owner rating0/25

Specifications

Seat height range	15.6 to 20.8 in (from manufacturer)
Seat width	Not listed by the seller
Seat depth	Not listed by the seller
Seat depth adjustable	Yes
Seat cushion	Foam
Cushion thickness	Not listed by the seller
Back material	Mesh (from manufacturer)
Backrest height	Not listed by the seller
Backrest width	Not listed by the seller
Armrests	1D (height only)
Lumbar support	Form-Sensing Mesh Technology (from Amazon listing)
Lumbar adjustments	Not listed by the seller
Headrest	Not listed by the seller
Max recline	Not listed by the seller
Tilt mechanism	weight-sensitive recline
Base material	Not listed by the seller
Casters	Carpet
Gas lift	Not listed by the seller
Weight capacity	400 lb (from manufacturer)
Chair weight	30 lb
Overall height	Not listed by the seller
Warranty	15 years
Certifications	Not listed by the seller

Fit Guide

A comfortable seat height is about a quarter of your body height. Here is how this chair's listed seat range lines up (how we rate).

Your height	Seat range	Fit	Weight
4'11" to 5'3"	15.6 to 20.8 in seat (ideal about 15.3 in)	Seat may be too high	Rated to 400 lb
5'4" to 5'7"	15.6 to 20.8 in seat (ideal about 16.4 in)	Good fit	Rated to 400 lb
5'8" to 5'11"	15.6 to 20.8 in seat (ideal about 17.4 in)	Good fit	Rated to 400 lb
6'0" to 6'3"	15.6 to 20.8 in seat (ideal about 18.4 in)	Good fit	Rated to 400 lb
6'4" and up	15.6 to 20.8 in seat (ideal about 19.3 in)	Good fit	Rated to 400 lb

Mesh backFoam cushionCarpet castersWeight-sensitive reclineSeat depth adjustment

What We Like

The 15-year warranty is the longest in its category, and the listing calls it a round-the-clock warranty.
The seat drops to 15.6 inches and rises to 20.75, which helps shorter sitters keep their feet on the floor.
The recline is described as weight-sensitive, the seat depth adjusts and the chair is rated for 400 lb.

Watch Out For

The 4.8 rating rests on a single review, so it says little yet about how the chair holds up.
The Duron arms are listed as 1D, so they adjust in height only.
The lumbar support is described as form-sensing mesh, and the listing does not state any separate lumbar height or depth adjustment or a headrest.

At a Glance

Carpet casters, a foam cushion under the mesh seat and a 15-year warranty set this Humanscale Diffrient World apart from its hard-floor twin. It is rated for 400 lb, weighs 30 lb, and its 4.8 rating rests on a single review.

Who This Chair Is For

Carpeted offices, since the casters are listed for carpet.
Shorter sitters, with a seat that goes down to 15.6 inches.

Who Should Look Elsewhere

Anyone who wants arms that adjust in more than height.
Shoppers who want review history to lean on: the 4.8 rating comes from one review.

How the carpet-caster Diffrient World senses your weight

The recline is described as weight-sensitive and the seat depth is adjustable. The seat is mesh over a foam cushion, the chair rolls on carpet casters, and the lumbar support is described as form-sensing mesh. The listing does not state a separate lumbar adjustment, a headrest or the maximum recline angle.