The Isolfon products in this category of audio materials include sound-absorbing panels made of flexible polyurethane foam with various surface configurations, in different thicknesses, with different sound absorption coefficients. They address sound absorption and noise control issues in structural acoustic applications and industry in a simple, quick, and economical way. They are also known as ricofon or ricofon.

Their application is very easy, and due to their flexibility, they can be glued to any surface, offering an easy and economical solution for increasing sound absorption, reducing the reverberation time of standing waves, and multiple reflections in rooms with simple acoustic requirements.