The seat shell of HAL RE Armchair Tube Stackable is made of recycled plastic. Despite the organic curves of its armrests, the chair's unobtrusive, four-legged tubular steel base can be stacked – without the optional seat cushion – and is therefore suited for use in auditoriums or restaurants, and other settings in which the number of chairs must be flexibly adaptable. HAL RE Armchair Tube Stackable can also be ordered with a stacking trolley, as well as as with row connectors and seat numbering elements.