Waterproof means worryproof! Not all underlayments are created equal, and Eco Cork Foam (ECF) is the ONLY underlayment with a built-in 6 mil vapor barrier and the only one to deliver 10 features in every roll. With Eco Cork Foam plus your flooring, you have everything you need. Buy the floor. Buy ECF. You're done. Engineered using a proprietary blend of polyethylene and granulated cork, ECF is technologically advanced and outperforms the competition in every way, from moisture protection and ease of installation to superior sound reduction. Ultra-Fresh® antimicrobial product protection helps keep Eco Cork cleaner, fresher, and more durable. Perfect for use on wood or concrete subfloors and on any level of your home, including basements. When used over a concrete subfloor, ECF eliminates the need for an additional vapor barrier, saving time and money. AK