maybe cotton wool or fabric or sponge or maybe even plastic i suppose you can have softened wood.you cant have blue tak or metal or anything like that i hope this helps you make some pairs of ear...
Before the question can be answered, we'll need to know how the cushion will be used. Indoors? Outdoors? Both? Will it get a lot of wear or a little? Will it get wet or will you need to wash it? Will...