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. A pack of extra air cells may be purchased with the cushionThe 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.

• Approximately 3.5 inches thick  
• Approximately 2.5 pounds
• The cushion comes with 1 cover