Mass Loaded Vinyl (MLV) is a dense, flexible material used primarily for soundproofing. It is made from a combination of vinyl and heavy fillers, which gives it its mass and sound-dampening properties. MLV is often installed in walls, ceilings, and floors to reduce noise transmission between rooms or from outside sources. This material is popular in both residential and commercial settings due to its effectiveness and ease of installation. MLV can be cut to size and applied directly to surfaces, making it a convenient option for improving acoustics in spaces like home theaters, recording studios, and offices.