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Task Chair | Activity by Herman Miller

Activity features a weight-sensitive mechanism that responds to your body instantly, delivering serious comfort in a flash. This lightweight office chair was designed for choice: armrests, back and seat all adjust so that you can sit where and how you want to.

Mobility first: designed to encourage movement, Activity features Activeback™, a lightweight backrest with enhanced back support. Made from MPA (Modified Polyamide), Activeback™ varies in thickness from top to bottom and from the center to the outer edges, providing flexibility and support where your bodies needs it most. Its tapered edges provide a visual contour, giving Activity its sleek, clean-lined look.

The arms move in four directions, facilitating adjustments to height, angle, depth and width. The armrests have also been specially engineered, enabling them to flip 360 degrees.


  • Weight-sensitive mechanism
Seat height: 

Aluminium base 390-500 mm

Nylon base 390-500 mm

Seat depth:

Adjustable seat 380-430 mm


Synchronised 1 lock

Weight sensitive 4 lock

Maximum user weight:

120 kgs

  • Lightweight backrest with enhanced back support
  • Flexible arms with height, angle, depth and width movement
  • Armrests can flip 360 degrees
  • Recline travel limiter
  • Tilt angle to 20 degrees
  • Four position back lock
  • 12 year Warranty

Downloads and Links:

Product Sheets: Activity Chair
Gallery: HPA Installations