High quality 15×15 1/4 Neoprene used in conjunction with Vacuum Presses. This foam has been tested and proven to give you the definition of a swift press without having to use large pieces of plastic to form with. Use the standard 8×8 inch piece of plastic on your next mold and cover it with this high end foam to make a superior seal for definition and professional looking product. Start saving money using your swift / vacuum press by using less product each time!