The Heathrow HEAVY-DUTY chair is available with 3 armrest options:

 Multi-Adjustable Armrest

The Multi-Adjustable Armrest is height, width and depth adjustable, and provides the greatest ergonomic functionality. The MULTI-ADJUSTABLE armrest is suitable for anyone up to 130kg.
Height Adjustable Armrest

The Height Adjustable Armrest. This armrest offers less ergonomic functionality than the multi-adjustable arm, but is steel reinforced. The HEIGHT ADJUSTABLE armrest is suitable for anyone up to 150kg.

 Stratos Armrest

The heavy duty Stratos Armrest armrest is not adjustable and is designed for extreme use. The STRATOS armrest is suitable for anyone up to 180kg.