Sound absorption is provided by double-sided Texaa® Sound-absorbing acoustic curtains which prevent light from passing. They are highly flame-resistant and clad on both sides with run-resistant, antistatic and dirt-repellent Aeria fabric, in combination with two layers of 3-mm thick sound-absorbing black felt wadding. Each curtain is hemmed at the bottom and may be joined to others using zips inserted in their side seams, matching the colour of the fabric chosen.