"The Foam in Place Seat Modification has built in ABS( plastic) laterals to provide support during the foaming process. 1 1/4"" viscoelastic foam is included to ensure that adequate pressure relief is attained. Dual side mount zippers allow easy access to pour the foam. Bowl Pack of Soft Liquid Sunmate Foam is standard. Bag Pack is available as a no charge option. One unit of foam is standard - additional foam available. Clinician should have FIP experience."