Acoustic underlay is a type of material installed beneath flooring to reduce sound transmission between rooms. It acts as a barrier, absorbing impact noise from footsteps and other activities, making spaces quieter and more comfortable. This is especially beneficial in multi-story buildings where noise can easily travel between floors. Typically made from foam, rubber, or felt, acoustic underlay is compatible with various flooring types, including laminate, hardwood, and carpet. By improving sound insulation, it enhances the overall acoustic quality of a room, contributing to a more peaceful living or working environment.