Silentum acoustic felts by Lehner Wolle - nature meets innovation Sould insulation and room climate system made of natural vi ... rgin sheep's wool. Healthy, flexible and sustainable: With the SIlentum acoustic felts, the Austrian company Lehner Wolle presents an innovative sound insulation and room climate system for interior design. We are specialists for 100% pure virgin sheep's wool. With Silentum acoustic felts we are introducing a contemporary solution that not only optimizes acoustics, but also cleans indoor air "en passant" - permanently and biocide-free. read more