Sonic Red Underlay 3mmLignum Additions Underlay Sonic Red 3mm provides essential support and cushioning beneath your flooring. This 3mm underlay reduces impact noise, improves comfort underfoot, and helps extend the life of your floor by absorbing stress and movement. Ideal for use under laminate, vinyl, and engineered wood flooring, it creates a smoother surface while offering thermal insulation properties. Easy to install and cost effective, this underlay is a practical