3mm thick underlayment reduces both reflective sound noise and through the floor sound transmission. Conceals minor sub flooring imperfections and cracks. Includes attached moisture barrier protection (No extra film required). Mold and mildew resistant / Non allergenic. Pre attached tape and overlap for easy installation. Can be used for laminate flooring, hardwood flooring, & engineered hardwood flooring. Installation over concrete subfloors & all wood subfloors.