A vocal booth should generally have a dry sound. It's common practice to cover the walls and ceiling with absorbers, to prevent any reflections from reaching the microphone. Vicoustic can provide you with everything you need, from a simple price efficient set up to a more luxurious and complete solution.
Vicoustics' professional line of products can help get your sound just right! For more portable solutions, we often recommend the Flexi Panel and the Flexi Screen line of products.