AW325 & AW30MB are designed for use beneath hardwood, laminate, and engineered wood floors. Used for wood floor installations only, on concrete or wood sub-floors beneath Acoustiblok Blok16 & Blok32. AW-WF0.125 works to decouple and isolate the top floor surface from the subfloor. The 1/8" thick wool composite is lightweight, flexible and easy to work with. AW-WF0.125 is available with or without a moisture barrier laminated to the bottom. Both have an antimicrobial treatment to prevent mold growth, extremely resilient, sustainable, and won™t break down like the air pockets in foam types of underlayment.