The Vicair Active O2 wheelchair cushion — the manufacturer's replacement for the older Versa X model — can generally be categorized as a hybrid cushion due to its weight bearing foam and air-filled cells. The manufacturer of this product, Vicair (in the USA - The Comfort Company is the source) specifies this cushion as follows.
Vicair's Active O2 consists of a contoured foam front and a pre-contoured array of 5 individually adjustable chambers in the rear. Each chamber contains a user-changable quantity of permanently sealed tetrahedron-shaped air cells.
Vicair accomplishes the weight bearing function differently than other manufacturers of air cushions. The Vicair Active O2; in addition to foam, 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 rear portion of the cushion can be adjusted by unzipping the liner and removing or adding an appropriate number of air cells. A pack of 50 extra air cells may be purchased with the cushion (refer to the cushion options above).
The Active O2's many-cell structure eliminates the leak-related catastrophic failure mode associated with other types of air cushions. The tetrahedron-shaped cell structure also slightly increases the user's seating stability as compared to typical passive, valved-type air cushions. The Active O2's foam front portion also provides a stable hand-placement surface for transfers (i.e., transferring into and out of the wheelchair). When compared to both valved and non-valved air-only cushions, the Active's foam front substantially increases transfer stability for people with spinal cord and other injuries.
NOTE ABOUT SHIPPING: Vicair Active O2 cushions are made-to-order. The manufacturing process typically takes 4-5 business days. For example, if the "Fast" shipping method is selected for a Vicair Active O2, the actual transit time will indeed be fast (1-2 business days), but your cushion may be delayed by 4-5 business days before leaving the facility. Additionally, non-standard sizes (sizes highlighted with colors) require substantially longer lead times. Please consider these manufacturing times when selecting the shipping speed for Vicair cushions.