You have your "soundproof" curtains and blankets, vibration insulation pads, sound-absorbing panels, and the usual acoustic foam. But if you were considering egg cartons, you might be looking for ...

ULTIMA Lay-in and Tegular Tiles from Armstrong’s Kanopi line are a smooth, cohesively designed solution to sound absorption in flexible spaces.

Cellular cast aluminum foam, sound absorbing properties, strong yet lightweight panels, versatile material, contains up to 100% recycled content, corrosion resistant. Alusion™ Small Cell ...

Along with its unique appearance, it has sound-absorbing properties making it ideal ... Cymat'sfoam creates strong yet lightweight panels. Similar in appearance to a metallic sponge, Alusion ...