The Vicair Adjuster wheelchair cushion can generally be categorized as an air cushion due to its weight bearing air-filled cells. The manufacturer of this product, Vicair (in the USA - The Comfort Company is the source) specifies this cushion as follows.
The low profile version of the Adjuster can be used successfully when buttocks area pressure sores are not present.
Vicair accomplishes the weight bearing function differently than other manufacturers of air cushions.
The Vicair Adjuster employs many small permanently sealed air filled cells, rather than larger valved air cells.
Each of the many small Vicair air cells is shaped like a tetrahedron (a volume enclosed by four sides).
The feel of the cushion can be adjusted by unzipping the liner and removing or adding
an appropriate number of air cells.
NOTE: For this particular manufacturer's cushions, the elapsed shipping time often spans an additional 3 business days. So, if the "Fast" shipping method is selected for this particular cushion, the actual transit time will indeed be faster, but Vicairs are typically delayed by 3 business days before leaving the facility.