Product details
- Brand
- Humanscale
- Color / finish
- Black mesh / black Vellum seat / black frame
- Product type
- Ergonomic mesh-back task chair
Description
Designed by Niels Diffrient, the Humanscale Diffrient World uses a lightweight frame and a recline system that responds to your weight. Three shaped mesh panels support the back, while the backrest pivots as you move. The approach suits people who prefer a responsive chair without repeatedly setting recline tension.
This exact W11BM10V101 configuration is important: its seat is black Vellum upholstery over foam. Although the World family is often described as all-mesh, this version has a cushioned seat. It also specifies height-adjustable Duron arms, black frame and trim, a standard cylinder and standard hard casters.
Features
- Tri-panel mesh back: Monofilament Stripe mesh creates a contoured supporting surface.
- Vellum upholstered seat: the black textile covers a foam seat rather than an exposed mesh seat.
- Weight-responsive recline: the frame’s geometry balances movement without a conventional tension dial.
- Pivoting backrest: changes its angle as you shift and recline.
- Height-adjustable Duron arms: set the arm supports to the height you use at the keyboard.
- Seat-depth adjustment: move the seat to maintain back contact and leave clearance behind the knees.
Specifications
- Approx. chair width
- 26 in.
- Base width
- 24 in.
- Listed chair weight
- 28 lb
| Manufacturer model | W11BM10V101 |
|---|---|
| Back | Monofilament Stripe mesh, Black |
| Seat | Vellum Black upholstery; standard foam |
| Frame / trim | Black / black |
| Arms | Height-adjustable Duron |
| Cylinder / wheels | Standard 5-inch cylinder; standard hard casters |
| Chair width / base | Approximately 26 inches / 24 inches |
| Chair weight | 28 lb |
| Product identifier | UPC 638317172334 |
Confirm the configuration that matters
| Mesh or upholstered seat? | This model has the upholstered Vellum foam seat. Choose by the exact model code, not a general World-family description. |
|---|---|
| Arms | W11 specifies height-adjustable Duron arms; armless and fixed-arm versions are different configurations. |
| Flooring | Standard hard casters are generally intended for carpet or other soft surfaces. Check a suitable mat or compatible caster choice for hard flooring. |
| Desk clearance | Use the approximately 26-inch chair width for the opening; 24 inches is the base width. |
A responsive chair with a compact base
The 24-inch base and relatively light construction can be useful in a home office where you regularly move the chair away from the desk. Allow additional space for the arms, your body and rearward movement rather than treating the base diameter as the whole working footprint.
Set height and seat depth before testing the recline. Sit back into the mesh and keep the keyboard close enough that you are not reaching away from the support. If you strongly prefer a locked upright back, compare that requirement with World’s freely responsive design.
Humanscale’s standard task-chair guide gives an approximate 15.7–18.25-inch usable seat-depth range. Treat usable depth as the distance from the supporting back surface to the seat front, not the total cushion length. This distinction is particularly useful when comparing chairs for shorter thighs.
What's included
- One Diffrient World W11BM10V101 task chair
- Black Vellum foam seat, black mesh back and adjustable Duron arms
- Standard cylinder, black base and hard casters
Common questions
Is this an all-mesh chair?
No. The exact manufacturer specification identifies a Vellum upholstered foam seat with a mesh back.
Why is it called Diffrient?
It is named for its designer, Niels Diffrient. The model is Diffrient World; “Different World” is a common misspelling.
Are the arms fixed?
No. This W11 configuration includes height-adjustable Duron arms.
Does it have a tilt lock or headrest?
Neither is specified. World uses a weight-responsive recline without a conventional recline lock, and this configuration has no headrest.
Product information & sources
The exact W11BM10V101 manufacturer sheet confirms the Vellum upholstered foam seat, adjustable arms and standard hard casters. The US specification guide supplies usable seat-depth measurements and distinguishes overall chair width from base width. Humanscale W11BM10V101 exact configuration sheet; Humanscale US specifications and upholstery guide; Office-chair owner discussion of fit and mechanism preference. Reviewed September 2026.
Need help choosing? Contact Eco Home Office. See our shipping details and returns policy.