J2 Wheelchair Cushion combines the oversized, trisection JayFlow™ Fluid Pad with a light-weight, closed-cell (molded) foam base. The pad ensures shear reduction, provides a soft contoured seating surface and locates optimal gel protection directly under the bones that need it most. This exceptional pad maintains its viscocity at all ambient temperatures for consistent protection.Fluid pad attaches to foam base with color-coded hook and loop straps. Black ballistic stretch cover with nonskid bottom included. Intended for use on a flat-base wheelchair.To use this product with a sling-seat chair, you will need a J2 Solid Seat Insert™, available separately.J2 Solid Seat Insert nestles into the sling seat to create a flat seating surface for the J2 Cushion. Honeycombed aluminum covered in black vinyl. Select a J2 Solid Seat Insert to match the J2 Cushion. Not recommended for use with other cushions.