Sorbothane - subject to Manufacturers price change Sorbothane is an impact absorbing polymer. We stock Sorbothane sheet in Black, Red, and Clear, various thicknesses, and bumpy or smooth. Frequently used behind bullet hit shields to minimize the impact. Our Sorbothane is made in lots for us to our specifications. In this picture, the top sheet is clear, followed by red, black, black bumpy and red bumpy, separated by clear polyethelene.