The Invacare Cushion Rigidizer is made from lightweight plastic and fits between the seat rails for level support and to eliminate the hammock effect of seat upholstery. The Cushion Rigidizer securely attached to the bottom of the cushion inside cushion cover. For Quotes and Orders, please contact Matrx Seating & Positioning Customer Service at -1-888-433-6818 or visit www.motionconcepts.com for more product information.