MP Global Underlayment - QuietWalk Versa 100sft, $64.99 USD/Box, LL Flooring (Lumber Liquidators)

QuietWalk Versa provides protection with its built-in vapor barrier and moisture-wicking fibers, shielding your flooring investment from water and high pH levels. The patented fiber construction helps absorb sound to create a quieter living space. It smooths minor floor flaws, adds insulation value, and is suitable for in-floor heating systems. Made from recycled fibers and designed for use with attached pad flooring, this product is manufactured in the USA.