The Single Ring Cushion is an all purpose pressure reducing device. Can be used to support heels, knees and elbows. Protects the head, ear, iliac crest and other crucial pressure points. It is carefully designed for optimum stability while in use. It was cut and developed to provide maximum exposure to operative sites and can be bonded with other materials to create performance composites for specific applications. It utilizes environmentally-friendly Harvest Foam, which is eco-friendly foam alternative resulting in a 61% reduction of non-renewable energy use. Meets or exceeds all EPA requirements. Production requires 23% less in total energy demand and 36% less global warming emissions. Measures 9 X 4.5 X 2. Case of 36.