Molded Foam General Use Cushions fit most seat depths and will work well with most K0001, K0002, K0003 and K0004 wheelchairs from any manufacturer. And, these cushions work very will with our Viper Plus GT (K0004) and Cruiser III (K0003) wheelchairs, each with built-in seat extension and extendable upholstery. Wheelchairs are designed to be used with cushions. Most patients can benefit from and qualify under Medicare for these E2601 cushions, provided they have a written physician order, and have qualified for and received a wheelchair from Medicare. Our cushions have a unique construction of high resilient (HR) molded foam which provides optimum stabilization, position, pressure reduction and seating posture. Specifically designed for patients who are at a low risk for skin breakdown.