Ultimate Cushion underlayment is made from over 90% post-consumer recycled material with two of the five options containing foam. Ultimate's rubber underlayment is extremely durable and is impervious to the effects of moisture exposure. Ideal for below grade installations, Ultimate Cushion rubber underlayment will not rot or cultivate mold or mildew. Ultimate Cushion is FloorScore certified, CHPS compliant and can contribute to LEED credits.