Humanscale World LM Task Chair – Upholstered Seat

Name: Humanscale World LM Task Chair - Upholstered Seat
Brand: Humanscale
SKU: 1131-BK-BK
Availability: InStock

SKU: 1131-BK-BK

Designed by ergonomics pioneer Niels Diffrient, the Diffrient World LM chair delivers intelligent comfort through refined simplicity. Featuring an upholstered seat and mesh back, this versatile task chair offers lightweight support that feels effortless in modern workspaces.

Price range: $595.00 through $695.00

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Description

Designed by ergonomics pioneer Niels Diffrient, the Diffrient World LM chair delivers intelligent comfort through refined simplicity. The LM is the updated version of the highly successful World One chair.

This mesh version features a breathable mesh seat and and an upholstered padded seat, offering lightweight support that feels effortless in modern workspaces.

At its core, the World LM chair uses Humanscale’s Form‑Sensing Mesh Technology, which automatically adapts to the sitter’s body to provide continuous, personalised support—without the need for bulky mechanisms or constant adjustments. The mesh construction promotes airflow while subtly supporting the lower back for all‑day comfort.

With just seat height adjustment—the World LM keeps operation intuitive. Its weight‑sensitive recline responds naturally to the user, delivering balanced support at every position and encouraging healthy movement throughout the day.

Clean in design, responsive in performance, and visually light, the Diffrient World LM chair reflects Humanscale’s belief that great ergonomics should feel natural—proving that thoughtful simplicity can make a powerful difference.

Features:

Tri-panel, non-stretch mesh construction creates body-fitting contours and self-adjusting lumbar support for an automatic, customized fit
Upholstered padded seat
Provides appropriate support and automatic resistance regardless of user’s size
No unnecessary recline locks or tension springs to set or adjust
No external lumbar devices to adjust, break or lose
Optional height adjustable arms
No seat depth adjustment
Frame-less front edge eliminates contact stress behind the knee
Standard casters for hard surfaces
Designed for users up to 136kgs
12 year structural warranty: 5 years on mesh, fabrics and arm pads

Colours

Black Frame with Black Catena Mesh Back
Black Upholstered fabric seat
Optional black height adjustable Duron arms
Contact us if you need a quote for custom colours and specifications

Fabric Specifications:

Catena Mesh - A non‑stretch ergonomic mesh engineered specifically to work with Humanscale’s tri‑panel back frame, providing automatic lumbar contouring without adjustment.

Composition:

- 69% Poly‑elastomeric
- 22.4% Nylon
- 8.6% Polyester
Construction: Proprietary non‑stretch woven mesh
Design intent: Structured support with no sagging over time
Abrasion: 150,000 Wyzenbeek double rubs
Pilling resistance: Class 5 (highest rating)
Light fastness: 40 hours
Tensile strength:
- Warp: 364 lbs
- Weft: 390 lbs
Seam slippage:
- Warp: ~105 lbs
- Weft: ~118 lbs
Flammability: California TB 117‑2013 compliant

Sustainability:

BIFMA LEVEL 3 certified
SCS Indoor Air Quality Gold certified
Free of harmful toxins, including Chrome 6, PVC, Formaldehyde, PFC stain-resistant coatings, HFR flame retardants
Manufacturer's factory runs on 100% renewable energy
Humanscale’s BEAM program will divert product from landfill when the customer no longer needs it

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Product FAQs

What is the Humanscale World LM Task Chair and what does it do?

The Humanscale World LM Task Chair is an ergonomic office chair designed to provide intelligent comfort through its refined simplicity. It features a breathable mesh seat and an upholstered padded seat, adapting to the user's body for continuous personalised support throughout the workday.

Who is the Humanscale World LM Task Chair designed for?

What are the key features of the Humanscale World LM Task Chair?

What are the main benefits of using the Humanscale World LM Task Chair?

What are the dimensions or specifications of the Humanscale World LM Task Chair?

What materials is the Humanscale World LM Task Chair made from?

Does the Humanscale World LM Task Chair come with a warranty?

How do I care for or maintain the Humanscale World LM Task Chair?

Humanscale Humanscale office furniture: ergonomic, sustainable and innovative. Includes a line of award-winning products that are designed to improve the health and comfort of work life. Humanscale office furniture is made by Humanscale, a US-based company that has been creating ergonomic solutions for over 35 years. Humanscale office furniture is ergonomic, meaning that it follows the natural movements and postures of the human body. The chairs, desks, monitors, keyboards, and accessories are all adjustable, flexible, and intuitive to use, helping to reduce the risk of musculoskeletal disorders, such as back pain, neck pain and carpal tunnel syndrome._x000D_ Humanscale strives to minimize the environmental impact of its production and use, using recycled or renewable materials, minimal energy and water and a long lifespan. They meet or exceed the highest standards of environmental certification, such as LEED, BIFMA and Greenguard. Bad Backs is a leading retailer of ergonomic products that promote health and wellness, so if you are looking for ergonomic, sustainable and innovative furniture for your work space, look no further than Humanscale office furniture ranges.

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