ROHO's Quadtro Select - sometimes erroneously called Quatro (i.e., omitting the "d") - wheelchair cushions can generally be categorized as air cushions due to their weight bearing air-filled cells. The manufacturer - ROHO - provides the following details.
The ROHO Quadtro Select cushion consists primarily of a matrix of air-filled neoprene cells. As suggested by its name, each of the Quadtro's four quadrants can contain dissimilar volumes of air. The air volume variance can arise as a result of; for example, a pelvic obliquity associated with the person sitting on the cushion. ROHO's IsoFlo feature (ref. accompanying picture) permits or restricts; depending upon how it's set, the flow of air between quadrants.
Approximate thicknesses (i.e., air cell heights) for the three Quadtro Select variants are:
41/4" for the high profile ( H ),
31/4" for the mid profile ( M ), and
21/4" for the low profile ( L ).
In this context, profile height is synonymous with cushion thickness and air cell height. The Quadtro Select's three profile height options are often referred to as 4" , 3" , and 2" respectively. These thickness are measured with no one seated on the cushions (i.e., no load). As is the case with any cushion, when a person sits on a Quadtro the cushion compresses, thus reducing its thickness from its no load thickness.
ROHO chooses to specify their cushion's length and depth sizes by the number of air cells in the associated direction. For example, ROHO's 6x6 cell cushion is approximately 12 inches wide by 12 inches front-to-back.
The Quadtro Select's standard cover is made of several materials and includes a 2-way stretch Lycra top surface with a non-slip PVC-coated bottom surface. The extra cover options refer to purchasing a ROHO cushion and the extra cover(s) at the same time (not separately).
NOTE: These Quadtro Select cushions are made-to-order by ROHO. In the event that your preferred size is not on the shelf, the manufacturing process typically takes 3 business days. Please consider the manufacturing time when ordering this cushion.