Eclipse II is a closed cell insulation foam underlayment pad used under many floating vinyl floors. It creates a softer sound when walked on, as well as provides a good moisture block. Not all vinyl planks need this type of product, but until we have chosen a specific floating vinyl flooring to consider, it is best to add this total into our project budget.
Take a look at the product here: http://www.foamproducts.com/eclipse_main.shtml