Diffrient World

Diffrient World marks Humanscale's first foray into all-mesh task seating. Like its mesh-backed forerunner, Liberty, the Diffrient World chair's tri-panel backrest hugs the body to provide tailor-made lumbar support, while its mesh seat eliminates contact stress under the thighs. But Diffrient World’s major innovation is its mechanism-free recline action, which leverages two parts of the chair’s frame and the laws of physics to provide automatic, balanced support throughout the full range of recline. No chair is more intuitive, creating the ultimate user-friendly sitting experience.


An industrial design legend, Niels Diffrient has been called “the granddaddy of the ergonomic revolution.”
Read the bio

Responsible Design

Sustainability is the natural outcome of simple, elegant design.
Find out why


Physical Characteristics


  • Non-stretch, tri-panel mesh back
  • Non-stretch mesh seat
  • Optional upholstered polyurethane foam seat cushion

External Frame

  • Injection-molded, structural, integral color glass-filled Nylon 6

Stored Energy Devices

  • Pneumatic cylinder for adjustable seat height

Optional Foot Ring

  • Chrome-plated steel

Standard Features

Self-Adjusting Recline

  • Mechanism-free counter-balance recline action automatically provides the right amount of support through the full range of recline motion, regardless of user size and weight
  • No tension springs to adjust
  • No recline locks to set/release
  • During recline, the angle between torso and legs opens up for better body function
  • User maintains near-constant eye level during recline
  • Pivoting Backrest
  • Extra motion of the backrest during recline automatically adjusts to the changing needs of the spine
  • Provides additional lumbar support as needed

Form-Sensing Mesh

  • Tri-panel, non-stretch mesh construction creates body-fitting contours and self-adjusting lumbar support for a customized fit
  • No external lumbar devices to adjust, break or lose
  • Low-abrasion mesh protects clothing
  • Modular for easy replacement and upgrades

Non-Stretch Mesh Seat

  • Automatically sculpts to match body contours
  • Cradles the body in flexible, breathable mesh
  • Frameless front edge eliminates contact stress under the thighs

Standard Cylinder

Provides seat height range that accommodates 95% of the population

Body Fit

  • Size adjustable to fit 95% of the population
  • Form-sensing mesh provides perfect lumbar support—automatically
  • Manual adjustments for fit-to-size:
    • Seat Height: 5” (127mm) adjustment range
    • Seat Depth: 3.5” (89mm) adjustment range


  • 3” (76mm) standard hard casters

Optional Features

Armrest Options

  • Armless
  • Fixed armrests
  • Height-adjustable armrests with 3.2” (81mm) range of adjustment

Arm Pad Options

  • Flexible Duron
  • Matching textile-covered arm pad

Upholstered Seat Cushion

  • Mesh topped with a thin layer of polyurethane foam
  • Upholstered in a variety of textile options

Cylinder Options

  • Low cylinder for small users
  • Tall cylinder for very tall users
  • High cylinder with foot ring


  • CAL 133 certified

Caster Options

  • Non-rolling glides for fixed location use
  • Optional soft casters for hard floors

Foot Ring

  • Chrome finish
  • Height-adjustable


World Chair Specs

a Seat Depth
(from face of lumbar to front of seat)
15.75"– 18.5" (400mm – 469mm)
b Seat Height
(from floor to compressed front center of seat cushion)
14.61"– 19.49" (371mm – 500mm) standard
14.38"– 18.13" (365mm – 460mm) low cylinder
16.13"– 21.38" (409mm – 543mm) tall cylinder
19.63"– 27.63" (498mm – 701mm) high cylinder with footring
c Seat Width 19.49" (495mm)
d Backrest Height
(from seat cushion to top of backrest)
22.5" (571mm)
e Backrest Width 17.27" (437mm)
f Armrest Height
(from compressed seat cushion to top of armrest)
9.41" (239mm) fixed
6.77" – 9.41" (172mm – 239mm) adjustable
g Armrest Length
(from face of lumbar to front of armres)
8.27" (210mm)
h Distance between Armrests 18.5" (470mm)
i Height 36.5" – 40.51" (927mm – 1,029mm) standard
34.88" – 38.63" (886mm – 981mm) low cylinder
36.63" – 41.88" (930mm – 1,063mm) tall cylinder
40.13" – 48.13" (1,019mm – 1,222mm) high cylinder with foot ring
j Base Diameter 24" (610mm)
k Chair Width 25.98" (660mm)

Scope of Users

  • Standard chair fits more than 95% of the office population
    – 5’0” Woman to 6'4' Man
    – 100 to 300 lbs.
  • Users outside the standard range can be accommodated by Low or Tall Cylinder


27.5 lbs. (12.4kg) Conference Chair/Task Chair
25 lbs. (11.3kg) Armless Chair

Tilt and Recline

17° recline plus 8° backrest tilt

Reference Angle betwen Seat and Back

97.7° to 114.3°

Warranty Information

15 Years, 24/7 Warranty
Fabric/Cushions/Arm Pads:  5 Years, Single-Shift Warranty

Sustainabilityworld chair

We work hard to ensure that our environmental philosophy is reflected in each product we create. With our Design for Environment protocol, our designers and engineers examine the environmental impact of every choice made throughout the design process—from initial concept through final production. We invite you to read more.

A selection of sustainability highlights for Diffrient World::

Can help projects achieve valuable LEED credits >


White Chair

Black Chair

Gray Chair

Frame White World Frame: White Frame Black World Frame: Black Armpads World Gray Frame: Gray
Armpads World Gray Armpads: Gray Armpads World Black Armpads: Black Armpads World Gray Armpads: Gray
Basecaps World Brushed Steel Base Caps: Brushed Stainless Steel Basecaps World Black or Brushed Steel Base Caps: Black or Optional Brushed Stainless Steel Basecaps World Gray or Brushed Steel Base Caps: Gray or Optional Brushed Stainless Steel

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